The "parents - yikes" thread made me remember the single strangest scene I've ever seen at a game. Bear with me as it's a little long.
A 12U player hits a ball that maybe went over the fence or maybe it was a double that bounced over. It was a chain link fence and with the angle of the sun it was difficult to tell. I thought it bounced over for a double. The person on one side of me said it was a homer and another nearby never saw the ball. The nearest outfielder raised his handed and twirled his index finger to signify homerun. In fact, it was a homerun that just cleared the fence and then took a hop above the fence level. Umpire notes a ground rule double. He then conferred with homeplate and they both agree that it bounced over. As it turned out they got it wrong. They both saw the high bounce and due to the sun's angle just plain missed the call.
As soon as the ball bounced over, another older player was walking outside the fence. He casually picked up the ball and threw it back into the field and the ball was returned. This older player then walked over to the first base side of the field and began to warm up with his teammates for a game on an adjoining field.
As he arrived a mother walked up to him and put her finger in his face and said, "Do you know what you just did? You just took a homerun away from our team by throwing that ball in". She then continued to light up this poor kid who was extremely confused about what was going on. One of his coaches quickly came to his aid and then he caught the brunt of this woman's anger. For whatever reason she believed his throwing the ball back influenced the umpire's call against their team. Eventually she left and peace was restored. Or so I thought......
About fifteen minutes later, the mother of the kid who had thrown the ball back arrived from lunch. Someone explained to her how her son had done a harmless act of throwing the ball back and been screamed at by another woman. Guess what happens next? She storms over to the first woman and starts screaming at her. Tournament director is called over and has to get in between, etc....
And all of this happened over the ball being thrown back in.