This happened at Saturday's game between the Minnesota Wild and Colorado Avalanche in Denver. It begins with one Avs fan getting angry at visiting fans, and it ends with a much more dangerous Avs fan trying to punch a woman.
Keep your eye on the dude standing behind the belligerent Ray Bourque fan and the dude desperately trying to prevent his friend from starting a fight with some girls. At about the 56-second mark, you'll see that dude get slapped in the back of the head, presumably by the female Wild fan in the row behind him. That's when shit goes completely nuts, with the guy who got slapped in the head losing his mind and trying to pummel a woman.