Detroit Lions players warm themselves during the first half of a game against the Philadelphia Eagles. (AP Photo/Matt Rourke)

Seattle Seahawks cornerback Byron Maxwell runs with the ball after his interception against the San Francisco 49ers. (Ric Tapia/NFL)

The Philadelphia Eagles' DeSean Jackson stands on the field during the first half of the game against the Detroit Lions. (AP Photo/Michael Perez)

Pittsburgh Steelers strong safety Troy Polamalu dives for the end zone after intercepting a pass. (AP Photo/Don Wright)

Fans watch the first half of a game between the Philadelphia Eagles and the Detroit Lions as snow falls. (AP Photo/Matt Rourke)

Cleveland Browns cornerback Joe Haden upends New England Patriots tight end Matthew Mulligan after a catch. (AP Photo/Steven Senne)

New York Giants running back Peyton Hillis carries the ball into the end zone while San Diego Chargers linebacker Manti Te'o attempts to take the ball away. (AP Photo/Denis Poroy)

Baltimore Ravens wide receiver Marlon Brown scores a game-winning touchdown in the final seconds against the Minnesota Vikings. (AP Photo/Nick Wass)

Denver Broncos kicker Matt Prater (bottom) celebrates a 64-yard field goal with Britton Colquitt. The kick represented a new NFL record for longest successful field goal attempt. (AP Photo/Jack Dempsey)

Baltimore Ravens quarterback Joe Flacco hands the ball off to running back Ray Rice as snow falls. (AP Photo/Nick Wass)