Fans in costume during an NFL football game between San Francisco 49ers and Chicago Bears on Sunday, October 31, 2021 in Chicago, Illinois.

An Indianapolis Colts fan dresses in costume for an NFL football game against the Tennessee Titans on Sunday, October 31, 2021 in Indianapolis, Indiana.

A fan dressed as Elvis Presley on Sunday, October 31, 2021 in Atlanta, Georgia.

Indianapolis Colts fan during an NFL football game against the Tennessee Titans on Sunday, October 31, 2021 in Indianapolis, Indiana.

A young New Orleans Saints fan during an NFL football game against the Tampa Bay Buccaneers on Sunday, October 31, 2021 in New Orleans, Louisiana.

Atlanta Falcons fan during an NFL football game against the Carolina Panthers on Sunday, October 31, 2021 in Atlanta, Georgia.

NFL fans in costume during an NFL football game between the San Francisco 49ers and Chicago Bears on Sunday, October 31, 2021 in Chicago, Illinois.

A fan dressed up as Beetlejuice during an NFL football game between the Atlanta Falcons and the Carolina Panthers on Sunday, October 31, 2021 in Atlanta, Georgia.

Bears fans in costume during an NFL football game against the San Francisco 49ers on Sunday, October 31, 2021 in Chicago, Illinois.

A fan is dressed in a costume before an NFL football game between the New York Jets and the Cincinnati Bengals, Sunday, Oct. 31, 2021, in East Rutherford, N.J.

Fan in costume during an NFL football game, Sunday, Oct. 31, 2021, in Detroit.

Fans in costume during an NFL football game between San Francisco 49ers and Chicago Bears on Sunday, October 31, 2021 in Chicago, Illinois.

Fans dressed in Halloween costume during the second half of an NFL football game, Sunday, Oct. 31, 2021, in Atlanta.

A fan wears a costume before an NFL football game between the New York Jets and the Cincinnati Bengals, Sunday, Oct. 31, 2021, in East Rutherford, N.J.

Fans in costume during an NFL football game between San Francisco 49ers and Chicago Bears on Sunday, October 31, 2021 in Chicago, Illinois. (Todd Rosenberg/NFL)

Fans in Halloween costumes before an NFL football game between the Tennessee Titans and the Indianapolis Colts in Indianapolis, Sunday, Oct. 31, 2021.

Fans dress up in Halloween costumes at a Seattle Seahwaks NFL football game against the Jacksonville Jaguars, Sunday, Oct. 31, 2021, in Seattle.

Fans in costume during an NFL football game on Sunday, October 31, 2021 in Chicago, Illinois.

Indianapolis Colts fans pose in costumes on Sunday, October 31, 2021 in Indianapolis, Indiana.