Okay, my biggest pet peeve at sporting events?
The "O-ver-rated!" cheer that the winning team fans chant when they beat a team that is high ranking.
For example, the Syracuse fans just chanting that at #1 seed Oklahoma that they just beat.
Seriously, how stupid is that? It's like saying:
"You're overrated and that's why we beat you. You really must not be that good, because if you were we would not have been able to win."
If they really want to chant something that makes sense, why don't they yell "We were un-der-rated."