Pet Peeve

I have discovered a new pet peeve.  Today Dee and I went to watch the Angels V. Yankees (4-3 Win) and I learned that something that bothers me is the group that doesn't sit in the seats that they purchase.  Several groups around us failed to sit in the seats in which the purchased.  Now, because of this they would have to move when a new group showed up, they would have to move.

the problem is this seemed to continue through the entire game.  Now I know that it shouldn't bother me where people sit, but when they continue to get up, get in my way so I could not see the game that just bugs me.

So what are your pet peeves?  Is it the loud eater, the phone in the movies, what.