Mr Jan Yeo
Well-known Exeweb poster
I think it's mostly a football crowd thing. I've heard it in hockey on the other side of the pond, but other than that it's far rarer in other sports.I'm guessing it's a crowd thing rather than specifically a sport thing. I don't know much about the psychology of crowds but I do know that being in one alters an individuals behaviour, sometimes quite drastically, from how it might be if they were on their own. Similar in some ways to how it happens on the internet perhaps.