A Seattle Seahawks fan dressed in Halloween attire cheers against the St. Louis Rams during the second half of an NFL football game, Monday, Oct. 28, 2013, in St. Louis.(AP Photo/Tom Gannam)

Jaguars supporters pose for a photo as they arrive at Wembley Stadium in London to watch the NFL football game between San Francisco 49ers and Jacksonville Jaguars, Sunday, Oct. 27, 2013. (AP Photo/Sang Tan)

New Orleans Saints fan cheers during the second half at Mercedes-Benz Superdome on Oct. 27, 2013 in New Orleans, LA. New Orleans defeated Buffalo 35-17. (Crystal LoGiudice/USA TODAY Sports)

A Denver Broncos fan cheers against the Washington Redskins while wearing Halloween costume in the second quarter of an NFL football game, Sunday, Oct. 27, 2013, in Denver. (AP Photo/Jack Dempsey)

A fan dresses as Batman cheers in the second half of an NFL football game between the Minnesota Vikings and the Green Bay Packers, Sunday, Oct. 27, 2013, in Minneapolis. (AP Photo/Ann Heisenfelt)

A New England Patriots fan wears a Halloween mask as he watches the teams warm up before an NFL football game between the Patriots and the Miami Dolphins Sunday, Oct. 27, 2013, in Foxborough, Mass. (AP Photo/Michael Dwyer)

A Pittsburgh Steelers fan kisses a baby dressed as a football before an NFL football game against the Oakland Raiders in Oakland, Calif., Sunday, Oct. 27, 2013. (AP Photo/Ben Margot)

A fan dressed in costume watches the NFL football game between the New England Patriots and the Miami Dolphins, Sunday, Oct. 27, 2013, in Foxborough, Mass. (AP Photo/Michael Dwyer)

An Oakland Raiders fan watches during the first half of an NFL football game against the Pittsburgh Steelers in Oakland, Calif., Sunday, Oct. 27, 2013. (AP Photo/Marcio Jose Sanchez)

Fans dressed for Halloween cheer before an NFL football game between the Minnesota Vikings and the Green Bay Packers, Sunday, Oct. 27, 2013, in Minneapolis. (AP Photo/Kiichiro Sato)

A 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. (AP Photo/Ann Heisenfelt)

A young Chiefs fan was dressed for Halloween for their game against the Oakland Raiders during an NFL football game in Kansas City, Mo., Sunday, Oct. 28, 2012. (AP Photo/Reed Hoffmann)

Philadelphia Eagles fan dressed for Halloween during the fourth quarter against the Atlanta Falcons at Lincoln Financial Field on October 28, 2012. The Falcons defeated the Eagles 30-17. (Howard Smith/USA TODAY Sports)

Fans dressed in Halloween costume watch play between the Tennessee Titans and the Indianapolis Colts during overtime of an NFL football game Sunday, Oct. 28, 2012, in Nashville, Tenn. The Colts won 19-13. (AP Photo/Joe Howell)

A fan dressed for Halloween attends the NFL football game between the Detroit Lions and the Seattle Seahawks, Sunday, Oct. 28, 2012. in Detroit. (AP Photo/Duane Burleson)

Fans dressed in Halloween costume watch play between the Tennessee Titans and the Indianapolis Colts during the second half of an NFL football game Sunday, Oct. 28, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Fans dressed in Halloween costume watch play between the Tennessee Titans and the Indianapolis Colts during overtime of an NFL football game Sunday, Oct. 28, 2012, in Nashville, Tenn. The Colts won 19-13. (AP Photo/Joe Howell)

Fans watch the second half of an NFL football game between the Dallas Cowboys and the New York Giants, Sunday, Oct. 28, 2012, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Pittsburgh Steelers fans celebrate a 27-12 win over the Washington Redskins in an NFL football game in Pittsburgh, Sunday, Oct. 28, 2012. (AP Photo/Gene J. Puskar)

An Arizona Cardinals fans cheers during the second half of an NFL football game against the San Francisco 49ers, Monday, Oct. 29, 2012, in Glendale, Ariz. (AP Photo/Paul Connors)

Fans wear costumes as they watch in the first half of an NFL football game between the Detroit Lions and the Seattle Seahawks, Sunday, Oct. 28, 2012. in Detroit. (AP Photo/Paul Sancya)

A Dallas Cowboys fan dressed in an pink ape costume cheers on the team during an NFL football game against the New York Giants Sunday, Oct. 28, 2012, in Arlington, Texas. The Giants defeated the Cowboys 29-24. (AP Photo/Sharon Ellman)

Fans wear costumes during the second half of an NFL football game between the New York Jets and the Miami Dolphins Sunday, Oct. 28, 2012 in East Rutherford, N.J. (AP Photo/Seth Wenig)

A New York Jets fan watches during the second half of an NFL football game against the Miami Dolphins Sunday, Oct. 28, 2012 in East Rutherford, N.J. (AP Photo/John Minchillo)

A Pittsburgh Steelers fan wears a storm trooper costume and shows his "Terrible Towel" during an NFL football game against the Washington Redskins on Sunday, Oct. 28, 2012, in Pittsburgh. (AP Photo/Don Wright)

San Diego Chargers fans wear their Halloween costumes while they watch players warm up for an NFL game between the Kansas City Chiefs and the Chargers on Thursday, Nov. 1, 2012, in San Diego. (AP Photo/Denis Poroy)