When I was a kid, the students who played basketball were evenly separated into the group that liked the bulls and the group that liked the magic (my group). Our animosity managed to transcend basketball and our two groups straight up hated each other. We'd play against each other every recess and it would often get ugly.
One morning I ended up playing one of the kids one on one and although I was always an average player, this morning for whatever reason I was on fire. Every shot was dropping, I was stripping him of the ball, blocking shots, and leaving this dude looking foolish. Our groups were watching, as was my girlfriend, and it was getting heated. I was so fucking amped up by the end I thought we were going to kill each other.