These aren't really heckling stories, but here goes.
Last Friday night, my wife & I went to the game with my sister & her husband. After Frazier's throwing error, my sister yelled out, "OK, boys, settle down!". Three teenagers sort of jumped and turned around. I said, "someone's got a guilty conscience." Turns out it was a group from Milan High School ("Hoosiers") there with their Spanish teacher for the Reds Hispanic night (which I thought was pretty cool). We had a good laugh.
My family was at a game at Riverfront in center and when Michael Tucker tossed the ball up to me. With the glove on my hand, it glanced off and fell behind the wall. Tucker just put his hands up questioning and shook his head. My family hasn't let me live it down ever since.
When my son was about nine, we went up to Columbus for a Clippers game against Rochester. We're right down at the field and my son yells at the pitcher (Brian Shouse) the usual "we want a pitcher, not a glass of water," that Little League heckle. The game finishes when Augie Ojeda catches the final out at short and heading into the dugout hands it to my son. He asked him to autograph which he did. Then Shouse comes by and he asks him for an autograph too. He's signing it and I say, "yeah, he didn't mean that 'glass of water' thing. Shouse just chuckled.
Another time we went to Riverfront when we played the Cards. We went early to see if we could meet Tom Henke who is my wife's second cousin (they'd never met). Henke finishes shagging flyballs and is trotting in and the kids are hollering "Hey, Tom," but he continues on. Then my wife yells loudly, "Hey Tom Henke, we're related." Our oldest daughter dives under the seat, she's so mortified (pre-teen). Henke comes over, he and my wife trade notes "you're Grandma's Aunt Lettie; my Grandma's your Aunt Christine." He leaves my son with the ball autographed. [unrelated side note - both Henke's and my wife's grandmothers were both Rackers; Neil Rackers, the NFL kicker is from the same family - think he's my wife's 3rd cousin, once removed - little known trivia].
Finally, the only heckling of mine, was more a retort. When I coached my son's very young baseball team, we had a teenaged umpire who was calling everything a strike. One kid on the team, our shortest player, knew the strike zone fairly well. The kid umping keeps calling strikes on balls that in their eyes. He'd been doing it the whole game, basically telling me they ought to be coming up there swinging (me: "how will they learn the strike zone if you don't call it?"). He calls this poor kid out on a ball that was just over his head. I said to the ump, "young man, that won't be a strike on him for at least five years."