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A fan dressed in a Halloween costume cheers during the second half of an NFL football game between the New England Patriots and the Los Angeles Chargers, Sunday, Oct. 29, 2017, in Foxborough, Mass.

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Hear me roar

A fan dressed in a Halloween costume cheers during the second half of an NFL football game between the New England Patriots and the Los Angeles Chargers, Sunday, Oct. 29, 2017, in Foxborough, Mass.

Michael Dwyer/Associated Press

Fans wear Halloween costumes during an NFL football game between the New Orleans Saints and the Chicago Bears in New Orleans, Sunday, Oct. 29, 2017.

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Joke's on you

Fans wear Halloween costumes during an NFL football game between the New Orleans Saints and the Chicago Bears in New Orleans, Sunday, Oct. 29, 2017.

Bill Feig/Associated Press

A fan in a Halloween costume participates in halftime festivities during the Cincinnati Bengals NFL week 8 football game against the Miami Dolphins on Sunday, October 31, 2010 in Cincinnati, Ohio. The Dolphins won the game 22-14.

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Monster Mash

A fan in a Halloween costume participates in halftime festivities during the Cincinnati Bengals NFL week 8 football game against the Miami Dolphins on Sunday, October 31, 2010 in Cincinnati, Ohio. The Dolphins won the game 22-14.

Paul Spinelli/Associated Press/2010 Paul Spinelli

Oct 31, 2016; Chicago, IL, USA; Fans dress up in Halloween costumes for a game at Soldier Field between the Chicago Bears and Minnesota Vikings. Chicago defeated Minnesota 20-10.

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To the Moon and Back

Oct 31, 2016; Chicago, IL, USA; Fans dress up in Halloween costumes for a game at Soldier Field between the Chicago Bears and Minnesota Vikings. Chicago defeated Minnesota 20-10.

Mike Dinovo/USA TODAY Sports/Mike Dinovo

Oct 31, 2013; Miami Gardens, FL, USA; A Miami Dolphins fan dresses up for halloween before a game between the Cincinnati Bengals and the Miami Dolphins at Sun Life Stadium.

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Fright Night

Oct 31, 2013; Miami Gardens, FL, USA; A Miami Dolphins fan dresses up for halloween before a game between the Cincinnati Bengals and the Miami Dolphins at Sun Life Stadium.

Steve Mitchell/USA TODAY Sports/Steve Mitchell

A Miami Dolphins fan dresses up for Halloween during an NFL football game between the Miami Dolphins and the Cincinnati Bengals at Sun Life Stadium on Thursday, October 31, 2013, in Miami Gardens, Florida. The Dolphins defeated the Bengals 22-20 in overtime.

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Hulk Smash!

A Miami Dolphins fan dresses up for Halloween during an NFL football game between the Miami Dolphins and the Cincinnati Bengals at Sun Life Stadium on Thursday, October 31, 2013, in Miami Gardens, Florida. The Dolphins defeated the Bengals 22-20 in overtime.

Perry Knotts/NFL

Chicago Bears fans cheer during an NFL game against the Minnesota Vikings on Monday, October 31, 2016. The Bears defeated the Vikings 20-10.

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Beary Scary

Chicago Bears fans cheer during an NFL game against the Minnesota Vikings on Monday, October 31, 2016. The Bears defeated the Vikings 20-10.

Kevin Terrell/Associated Press

A New York Giants fan wearing a Superwoman costume after Halloween cheers for her team during the game against the Baltimore Ravens at Giants Stadium on November 16, 2008 in East Rutherford, New Jersey. The Giants defeated the Ravens 30-10.

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Superwoman

A New York Giants fan wearing a Superwoman costume after Halloween cheers for her team during the game against the Baltimore Ravens at Giants Stadium on November 16, 2008 in East Rutherford, New Jersey. The Giants defeated the Ravens 30-10.

Paul Spinelli/Associated Press/2008 Paul Spinelli

A Chicago Bears fan wears a scary Halloween face mask along with a team sweatshirt and hat during the 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

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Positively Defrightful

A Chicago Bears fan wears a scary Halloween face mask along with a team sweatshirt and hat during the 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

Paul Spinelli/Associated Press

A Chicago Bears fan wears a Star Wars face mask on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

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The Force is Strong

A Chicago Bears fan wears a Star Wars face mask on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

Paul Spinelli/Associated Press

A pair of fans dressed up for Halloween pose for a photo during the Dallas Cowboys NFL week 8 regular season football game against the Washington Redskins on Monday, Oct. 27, 2014 Arlington, Texas. The Redskins won the game 20-17 in overtime.

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Mr. and Mrs. Packman

A pair of fans dressed up for Halloween pose for a photo during the Dallas Cowboys NFL week 8 regular season football game against the Washington Redskins on Monday, Oct. 27, 2014 Arlington, Texas. The Redskins won the game 20-17 in overtime.

Paul Spinelli/Associated Press

A fan is dressed in costume for Halloween during the game between the Miami Dolphins against the Cincinnati Bengals at the Paul Brown Stadium on October 31, 2010 in Cincinnati, Ohio. The Dolphins defeated the Bengals 22-14.

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Pin Head

A fan is dressed in costume for Halloween during the game between the Miami Dolphins against the Cincinnati Bengals at the Paul Brown Stadium on October 31, 2010 in Cincinnati, Ohio. The Dolphins defeated the Bengals 22-14.

Scott Boehm/Associated Press

Fans dressed as Teenage Mutant Ninja Turtles for Halloween spend time tailgating in the parking lot of Gillette Stadium before an NFL football game between the New England Patriots and Miami Dolphins, Thursday, Oct. 29, 2015, in Foxborough, Mass.

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Heroes in a Half Shell

Fans dressed as Teenage Mutant Ninja Turtles for Halloween spend time tailgating in the parking lot of Gillette Stadium before an NFL football game between the New England Patriots and Miami Dolphins, Thursday, Oct. 29, 2015, in Foxborough, Mass.

Michael Dwyer/Associated Press

A Chicago Bears fan wears a costume on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

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Scare Tactics

A Chicago Bears fan wears a costume on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

Paul Spinelli/Associated Press

A Chicago Bears fan wears a costume on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

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Pot of Gold

A Chicago Bears fan wears a costume on Halloween night during the Chicago Bears 2016 NFL week 8 regular season football game against the Minnesota Vikings on Monday, Oct. 31, 2016 in Chicago. The Bears won the game 20-10.

Paul Spinelli/Associated Press

A fan with a zippered and painted face dressed up for Halloween gives a scary look during the Dallas Cowboys NFL week 8 regular season football game against the Washington Redskins on Monday, Oct. 27, 2014 Arlington, Texas. The Redskins won the game 20-17 in overtime.

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Zipped Up

A fan with a zippered and painted face dressed up for Halloween gives a scary look during the Dallas Cowboys NFL week 8 regular season football game against the Washington Redskins on Monday, Oct. 27, 2014 Arlington, Texas. The Redskins won the game 20-17 in overtime.

Paul Spinelli/Associated Press

New England Patriots fans, dressed for Halloween, show their support in the second half of an NFL football game between the Patriots and the Chicago Bears on Sunday, Oct. 26, 2014, in Foxborough, Mass.

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Heads Will Roll

New England Patriots fans, dressed for Halloween, show their support in the second half of an NFL football game between the Patriots and the Chicago Bears on Sunday, Oct. 26, 2014, in Foxborough, Mass.

Elise Amendola/Associated Press

A against the Green Bay Packers fan dresses for Halloween in the second half of an NFL football game between the Minnesota Vikings and the Green Bay Packers, Sunday, Oct. 27, 2013, in Minneapolis.

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Eye on the Prize

A against the Green Bay Packers fan dresses for Halloween in the second half of an NFL football game between the Minnesota Vikings and the Green Bay Packers, Sunday, Oct. 27, 2013, in Minneapolis.

Ann Heisenfelt/Associated Press

Buffalo Bills fans watch during the first half of an NFL football game against the Tampa Bay Buccaneers Sunday, Oct. 22, 2017, in Orchard Park, N.Y.

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Shark Attack

Buffalo Bills fans watch during the first half of an NFL football game against the Tampa Bay Buccaneers Sunday, Oct. 22, 2017, in Orchard Park, N.Y.

Adrian Kraus/Associated Press

Fans tailgate before an NFL football game between the Oakland Raiders and the Kansas City Chiefs in Oakland, Calif., Thursday, Oct. 19, 2017.

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Time for a Close Up

Fans tailgate before an NFL football game between the Oakland Raiders and the Kansas City Chiefs in Oakland, Calif., Thursday, Oct. 19, 2017.

Marcio Jose Sanchez/Associated Press

Houston Texans fans dressed in costume watch play against the Cleveland Browns during an NFL football game, Sunday, Oct. 15, 2017, in Houston.

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We Woke up Like This

Houston Texans fans dressed in costume watch play against the Cleveland Browns during an NFL football game, Sunday, Oct. 15, 2017, in Houston.

Eric Christian Smith/Associated Press

An Arizona Cardinals fan cheers on his team during the second half of an NFL football game against the Tampa Bay Buccaneers Sunday, Oct. 15, 2017, in Glendale, Ariz.

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Predator of the Red Sea

An Arizona Cardinals fan cheers on his team during the second half of an NFL football game against the Tampa Bay Buccaneers Sunday, Oct. 15, 2017, in Glendale, Ariz.

Ralph Freso/Associated Press

A Miami Dolphins fan dresses up for Halloween during an NFL football game between the Miami Dolphins and the Cincinnati Bengals at Sun Life Stadium on Thursday, October 31, 2013, in Miami Gardens, Florida. The Dolphins defeated the Bengals 22-20 in overtime.

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Duffman

A Miami Dolphins fan dresses up for Halloween during an NFL football game between the Miami Dolphins and the Cincinnati Bengals at Sun Life Stadium on Thursday, October 31, 2013, in Miami Gardens, Florida. The Dolphins defeated the Bengals 22-20 in overtime.

Perry Knotts/NFL

A football fan waits in the stands dressed for Halloween before the start of an NFL football game between the San Diego Chargers and the Kansas City Chiefs Monday, Oct. 31, 2011 in Kansas City.

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Luigi Time!

A football fan waits in the stands dressed for Halloween before the start of an NFL football game between the San Diego Chargers and the Kansas City Chiefs Monday, Oct. 31, 2011 in Kansas City.

Jeff Roberson/Associated Press

Fans in Halloween costumes are seen in the stands in the first half of an NFL football game with the Philadelphia Eagles and the Dallas Cowboys Sunday, Oct. 30, 2011 in Philadelphia.

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The BOO Crew

Fans in Halloween costumes are seen in the stands in the first half of an NFL football game with the Philadelphia Eagles and the Dallas Cowboys Sunday, Oct. 30, 2011 in Philadelphia.

Michael Perez/Associated Press/AP2011

Fans are seen in Halloween costumes in the second half of an NFL football game with the Philadelphia Eagles and the Dallas Cowboys Sunday, Oct. 30, 2011 in Philadelphia.

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Jeepers Creepers

Fans are seen in Halloween costumes in the second half of an NFL football game with the Philadelphia Eagles and the Dallas Cowboys Sunday, Oct. 30, 2011 in Philadelphia.

Matt Slocum/Associated Press

Denver Bronco fans watch the game against the Detroit Lions wearing Halloween costumes during an NFL football game, Sunday, Oct. 30, 2011, in Denver.

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Spooktacular

Denver Bronco fans watch the game against the Detroit Lions wearing Halloween costumes during an NFL football game, Sunday, Oct. 30, 2011, in Denver.

Joe Mahoney/Associated Press

A fan dressed in an Elvis Halloween costume watches the action during the third quarter of an NFL football gamebetween the Carolina Panthers and the Minnesota Vikings in Charlotte, N.C., Sunday, Oct. 30, 2011.

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Panther King

A fan dressed in an Elvis Halloween costume watches the action during the third quarter of an NFL football gamebetween the Carolina Panthers and the Minnesota Vikings in Charlotte, N.C., Sunday, Oct. 30, 2011.

Nell Redmond/Associated Press

Fans in Halloween costumes cheer in the first quarter of an NFL football game between the Tennessee Titans and the Indianapolis Colts on Sunday, Oct. 30, 2011, in Nashville, Tenn.

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Chew Times Two

Fans in Halloween costumes cheer in the first quarter of an NFL football game between the Tennessee Titans and the Indianapolis Colts on Sunday, Oct. 30, 2011, in Nashville, Tenn.

Wade Payne/Associated Press

Baltimore Ravens fan Mark Denis of Baltimore, Md., dressed in a Ravens' Halloween costume, tailgates before an NFL football game against the Baltimore Ravens in Jacksonville, Fla., on Monday, Oct. 24, 2011.

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May the Ravens Be With You

Baltimore Ravens fan Mark Denis of Baltimore, Md., dressed in a Ravens' Halloween costume, tailgates before an NFL football game against the Baltimore Ravens in Jacksonville, Fla., on Monday, Oct. 24, 2011.

Stephen Morton/Associated Press

Fans dress for Halloween as they watch the Arizona Cardinals and the Tampa Bay Buccaneers during an NFL football game Sunday, Oct. 31, 2010, in Glendale, Ariz. The Buccaneers defeated the Cardinals 38-35.

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Boo'tiful

Fans dress for Halloween as they watch the Arizona Cardinals and the Tampa Bay Buccaneers during an NFL football game Sunday, Oct. 31, 2010, in Glendale, Ariz. The Buccaneers defeated the Cardinals 38-35.

Ross D. Franklin/Associated Press

Fans, dressed in their Halloween best, watch warmups prior to the start an NFL football game between the Arizona Cardinals and the Tampa Bay Buccaneers Sunday, Oct. 31, 2010, in Glendale, Ariz. The Buccaneers defeated the Cardinals 38-35.

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Gruesome Twosome

Fans, dressed in their Halloween best, watch warmups prior to the start an NFL football game between the Arizona Cardinals and the Tampa Bay Buccaneers Sunday, Oct. 31, 2010, in Glendale, Ariz. The Buccaneers defeated the Cardinals 38-35.

Ross D. Franklin/Associated Press

Dallas Cowboys fans are dressed for Halloween during an NFL football game against the Jacksonville Jaguars, Sunday, October 31, 2010 at Cowboys Stadium in Arlington, Texas. The Jaguars won the game, 35-17.

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Pumpkin Fiesta

Dallas Cowboys fans are dressed for Halloween during an NFL football game against the Jacksonville Jaguars, Sunday, October 31, 2010 at Cowboys Stadium in Arlington, Texas. The Jaguars won the game, 35-17.

James D. Smith/Associated Press

New Orleans Saints fans in Halloween costumes are seen in the stands during an NFL football game against the Pittsburgh Steelers at the Louisiana Superdome in New Orleans, Sunday, Oct. 31, 2010.

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Mr. and Mrs. Pumpkin Head

New Orleans Saints fans in Halloween costumes are seen in the stands during an NFL football game against the Pittsburgh Steelers at the Louisiana Superdome in New Orleans, Sunday, Oct. 31, 2010.

Patrick Semansky/Associated Press

A fan dressed for Halloween, cheers on during the first quarter of an NFL football game between the Arizona Cardinals and the Tampa Bay Buccaneers Sunday, Oct. 31, 2010, in Glendale, Ariz.

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Clown Town

A fan dressed for Halloween, cheers on during the first quarter of an NFL football game between the Arizona Cardinals and the Tampa Bay Buccaneers Sunday, Oct. 31, 2010, in Glendale, Ariz.

Paul Connors/Associated Press

NFL fan Sara Lee, dressed in a Teletubby Halloween costume, poses near a grill while tailgating prior to a football game between the San Diego Chargers and the Tennessee Titans, Sunday, Oct. 31, 2010, in San Diego.

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Tele Tailgate

NFL fan Sara Lee, dressed in a Teletubby Halloween costume, poses near a grill while tailgating prior to a football game between the San Diego Chargers and the Tennessee Titans, Sunday, Oct. 31, 2010, in San Diego.

Gregory Bull/Associated Press

Fans dress up in halloween costumes for the Washington Redskins-Detroit Lions NFL football game in Detroit, Sunday, Oct. 31, 2010.

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Animal Party

Fans dress up in halloween costumes for the Washington Redskins-Detroit Lions NFL football game in Detroit, Sunday, Oct. 31, 2010.

Paul Sancya/Associated Press

Fans in Halloween costumes before an NFL football game at the Louisiana Superdome in New Orleans, Sunday, Oct. 31, 2010.

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Why so Serious?

Fans in Halloween costumes before an NFL football game at the Louisiana Superdome in New Orleans, Sunday, Oct. 31, 2010.

Gerald Herbert/Associated Press

Fans dressed for Halloween watch the Arizona Cardinals and Carolina Panthers during the second half of an NFL football game Sunday, Nov. 1, 2009, in Glendale, Ariz. The Panthers defeated the Cardinals 34-21.

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Clowning Around

Fans dressed for Halloween watch the Arizona Cardinals and Carolina Panthers during the second half of an NFL football game Sunday, Nov. 1, 2009, in Glendale, Ariz. The Panthers defeated the Cardinals 34-21.

Paul Connors/Associated Press

Seattle Seahawks fans Chet Morgan, left, and Lee Smith dress as cheerleaders for the team's game against the Carolina Panthers on Halloween, Sunday, Oct. 31, 2004, in Seattle. The Seahawks won, 23-17. Morgan is from Mill Creek, Wash., Smith is from Everett, Wash.

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Cheer for Halloween

Seattle Seahawks fans Chet Morgan, left, and Lee Smith dress as cheerleaders for the team's game against the Carolina Panthers on Halloween, Sunday, Oct. 31, 2004, in Seattle. The Seahawks won, 23-17. Morgan is from Mill Creek, Wash., Smith is from Everett, Wash.

Elaine Thompson/Associated Press

Decked out for Halloween Robbie Womble, left, and Matt Byler sit in the end zone before the Detroit Lions at Dallas Cowboys game in Irving, Texas, Sunday, Oct. 31, 2004.

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Jailbreak

Decked out for Halloween Robbie Womble, left, and Matt Byler sit in the end zone before the Detroit Lions at Dallas Cowboys game in Irving, Texas, Sunday, Oct. 31, 2004.

Donna McWilliam/Associated Press/2004 AP

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