Totally. Let off some steam & like you said, get the crowds into the spirit.I know this isn't the thread, but I'm surprised there was no mention that I saw, of the 3 gloves off brawls IN THE FIRST NINE SECONDS of the hockey match up, between the USA and Canada. I think the players may have even planned it, to fire up the crowds.
That being said, I think this is the first time in history that Americans heard their anthem being booed and were like "Yeah, that's fair".