Reading the majority of the comments on Twitter... are people really this incapable of recognizing body langauge?
They all think the team is actually fighting, and more specifically, that Tuukka is actually losing his cool and having a fit.
It is obvious they are having fun (the coach or someone probably started it and told them to let loose). Tuukka is clearly just acting it out and having fun with it. He even cheers like a Wookie with his arms in the air at the end. I can't believe anyone can watch this and think, "omg tuuka is a spaz and is losing it!"