I was accused of setting a house on fire. I was about 12 at the time, and a neighbhor kid I used to hang out with would no longer hang out with me. About a year after he quit hanging out with me, I asked him why. He said I set a house on fire down the block and "everybody knew it." I didn't even know a house was on fire a block down the road. I never heard of it until then. I still think they probably made it up, but he seemed quite convinced so maybe there was a house on fire.
I love Animals, and one day driving home from work (carpooling) with my brother when I was about 21, we were talking about animals or dogs, and if I remember right, we were talking about a car in front of us with a dog hanging out the window like it was about to fall out. I think he made the comment "You'd probably be happy if it did." That was quite a shock to me if I ever gave him the impression that I'd like to see an animal fall out of a car and run over on the highway.
I think it stuck me harder than the house on fire one.