My only game in the bleachers was a 2004 game against the Marlins. During batting practice, Brad Penny was in the OF shagging fly balls or jogging or whatever and some fans were giving it to him good. He turned around and gave it right back. It was awesome. In general, heckling is annoying though. In that game, Juan Encarnacion was the Marlins RF and this fan about 10 people to my left was yelling at him all the time. His jokes were funny in the 1st inning. They were redundant in the 3rd. By the 5th, everyone wanted to punch him in the face.