I've heard of riots for losing baseball games and the english with their football (soccer) riots. But I don't recall ever hearing a riot for an NFL game losing.
Yep, Canadians rioted over the Stanley Cup http://en.wikipedia.org/wiki/2011_Vancouver_Stanley_Cup_riot
If you haven't seen this yet. [video=youtube;Kk9oa_PiXAk]http://www.youtube.com/watch?v=Kk9oa_PiXAk[/video] "Now you are playing with the power."
[video=youtube;9yHl24QynOM]http://www.youtube.com/watch?feature=player_embedded&v=9yHl24QynOM[/video]