Canadians are generally friendly, but it's entirely a different story when Vancouver Canucks lose Stanley Cup. That would mean riot!
Here's a recap of the Game 7 of 2011 Stanley Cup where Boston Bruins won 4-0 against Vancouver Canucks.
Sometimes I don't understand people really. It's only a hockey game!
Update, June 18, 2011:
Here's a video from youtube.
According to a report, some anarchists are behind the Vancouver riot.