I used to do it when the park had lots of empty seats, but don't any more now that most seats are sold. Most of the time when I did it, I would just sit up in a pretty high row in the lower level(s)...where there was a section that was maybe about 1/2 empty. Once, though, at County I got greedy and saw 4 seats down by the dugout that were still empty in about the third inning. The usher soon came and said we could not sit there, it was the owner's box http://forum.brewerfan.net/images/smilies/embarassed.gif. At the last game I went to, my kid and I moved over a couple seats just because some tall cub fan with a huge head blocked our view of home plate. Whoever had the seats next to us never showed up.