I still have a childhood beef with the Kramer vs. Kramer kid, for "accidentally" throwing my childhood fishing rod into the local lake while trying to teach him how to fish near his bespeckled hippie mom.
I also felt really bad after we left the former little motorcycle kid from Chips at the party house in our collective teens, after he drank too much, threw up on their cocker spaniel, and our host's parents said they were calling the police on the rest of us because of him. We took off, scared for our lives.
I didn't know until later that I had screwed over a former child actor, or at least didn't know which one until a few years ago after he was already dead. He was super early into motocross. I loved Chips as a kid. It's sad, and it haunts me now.
Not even a made-up joke:/