Major Junior hockey is such fun:
[yt]http://www.youtube.com/watch?v=RACMXpql7_g[/yt]
(These two teams had a bit of a rivalry going on the year this happened. The game before this clip, in London, had a full line brawl. But this is more entertaining, given how quickly everything happens.

)
And the most famous incident in junior hockey:
[yt]http://www.youtube.com/watch?v=Iq4BLVRorKY[/yt]
At the 1987 World Junior championship in Czechoslovakia, Canada and the USSR became involved in a massive bench-clearing brawl. It lasted twenty minutes, and didn't end until arena officials decided to turn off the lights (which was only partially successful, as you can see a few minutes in). Both Canada and the Soviet Union were disqualified and banned from the end-of-tournament dinner. And both sides maintained it was the other that started hostilities.