As reported by FOX6 Sports, which apparently has video too. After the game, a Bears fan spit on Green Bay Packers FS Nick Collins and "used a racial epithet." Collins responded by either throwing a roll of tape, or maybe his mouthguard, at the classy fan. 

Collins has apologized (though not specifically to that idiot) and I'm sure will face some penalty for his actions. Should the league do anything in response to a natural reaction to an abusive situation?