Denver Broncos fans Vince Tate, left, and Sean Zweifel tailgate prior to a game against the Indianapolis Colts, Sunday, Sept. 7, 2014, in Denver. (AP Photo/Jack Dempsey)

Ricardo Goenaga, 26, of Miami, cooks while tailgating before a game between the Miami Dolphins and New England Patriots, Sunday, Sept. 7, 2014, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Tailgaters outside Soldier Field enjoy the nice weather before a game between the Chicago Bears and Buffalo Bills Sunday, Sept. 7, 2014, in Chicago. (AP Photo/Charles Rex Arbogast)

Denver Broncos fans tailgate prior to a game against the Indianapolis Colts, Sunday, Sept. 7, 2014, in Denver. (AP Photo/Jack Dempsey)

Oakland Raiders fan "Real Raider" Rob Simao grills while tailgating in the O.co Coliseum parking lot before a preseason game between the Raiders and the Seattle Seahawks in Oakland, Calif., Thursday, Aug. 28, 2014. (AP Photo/Jeff Chiu)

Green Bay Packers fan Marty McFarland tailgates before a preseason football game against the Oakland Raiders Friday, Aug. 22, 2014, in Green Bay, Wis. (AP Photo/Mike Roemer)

Denver Broncos fan Reanne Hueseman throws a beanbag while tailgating prior to the Broncos game against the Kansas City Chiefs, Sunday, Sept. 14, 2014, in Denver. (AP Photo/Brennan Linsley)

Cincinnati Bengals fans tailgate outside Paul Brown Stadium prior to a game between the Cincinnati Bengals and the Atlanta Falcons, Sunday, Sept. 14, 2014, in Cincinnati. (AP Photo/Frank Victores)

Oakland Raiders fans tailgate before the start of a game against the Houston Texans Sunday, Sept. 14, 2014, in Oakland, Calif. (AP Photo/Ben Margot)

Fans tailgate outside Lambeau Field before a game between the Green Bay Packers and the New York Jets Sunday, Sept. 14, 2014, in Green Bay, Wis. (AP Photo/Tom Lynn)

Mike Lackey of Utica, N.Y., tends the grill as he tailgates before a game between the Buffalo Bills and the Miami Dolphins on Sunday, Sept. 14, 2014, in Orchard Park, N.Y. (AP Photo/Gary Wiepert)

Fans tailgate before a game between the Buffalo Bills and the Miami Dolphins on Sunday, Sept. 14, 2014, in Orchard Park, N.Y. (AP Photo/Bill Wippert)

Fans tailgate before a game between the Green Bay Packers and the New York Jets Sunday, Sept. 14, 2014, in Green Bay, Wis. (AP Photo/Mike Roemer)