Public humiliation and forcing me to distribute my hard earned savings to people watching, because neighbourhood kid threw an apple at a rich persons house and I was nearby and didn't do anything.

Edit: I was little vague, due to being in a hurry.

My father has a tendency to brown nose anyone with wealth or influence. The "rich person" in question recognised me and complained to my father, about me and my friends, even though the apple thrower wasn't even part of my social group. My father decided please the neighbourhood with public demonstration of "taking responsibility".

Everyone present was horrified and nobody took my money. That infuriated my father even more, but in the end he was satisfied that I was crying. Lesson learned. Matter was never discussed again.

That "lesson" wasn't the only one, but that one stuck in my mind.