Oakland Raiders Dark Raiders fan watches during an NFL game against the San Francisco 49ers on Sunday, December 7, 2014 at O.co Coliseum. The Raiders defeated the 49ers 24-13. (AP Photo/Kevin Terrell)

Former Oakland Raiders player Lincoln Kennedy, center, poses for photos with Denver Broncos fan Julian Lopez, right, in the O.co Coliseum parking lot before an NFL football game between the Raiders and the Broncos in Oakland, Calif., Sunday, Nov. 9, 2014. (AP Photo/Jeff Chiu)

Scott Mason carries a toy blaster while wearing his "Steel City Storm Trooper" costume at a Pittsburgh Steelers pep rally, Thursday, Feb. 3, 2011 in Pittsburgh. Mason won a contest for the best costume. The Steelers face the Green Bay Packers in NFL football's Super Bowl XLV on Sunday, in Arlington, Texas. (AP Photo/Keith Srakocic)