Cheese heads and Clay Matthews fans celebrate during play between the San Francisco 49ers and Green Bay Packers at Candlestick Park in San Francisco on September 8, 2013.The 49ers defeated the Packers 34-28. UPI/Bruce Gordon
An Arizona Cardinals fan tries to encourage her team in the fourth quarter of the Cardinals-Seattle Seahawks game at University of Phoenix Stadium in Glendale, Arizona on October 17, 2013. The Seahawks defeated the Cardinals 34-22. UPI/Art Foxall
Dallas Cowboys fans wear horse masks during the Cowboys- Arizona Cardinals preseason game at University of Phoenix Stadium in Glendale, Arizona on August 17, 2013. The Cardinals defeated the Cowboys 12-7. UPI/Art Foxall
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