I heckled an Independent League RF playing for the KC T-Bones once. Some 140-lb RH slap hitter came to bat, and the RF was playing way too deep - about 10 feet from the wall. I yelled, "Hey right field, you're way too deep. This guy is going to drop one in front of you for a double."
And, of course, the guy did. He hit a little bloop over 2B, and the RF couldn't get there in time to hold him to a single.
Everyone on the RF stands started laughing.
After the play, I yelled, "Dude, you've gotta listen to me. I can get you out of this backwater league."
He flipped me off.