As Canderson said, I'm sure it happens in every city. I've never personally witnessed it in Pittsburgh.
Though - when my son was 13 or 14, we were sitting directly across the aisle from a guy who was probably toasted by 7am that day. EVERY time the Steelers got a first down, this dude staggers across the aisle and gives my son about 3 high fives. My son thought that was pretty funny. We still talk about that guy.