I used to act like a little brat turd when my grandparents used to babysit me. I did stuff like pour water on my grandpa when he got fully dressed for work, took black gak and made it into worm/snake shapes and put it in random places (grandman was scared of worms, grandpa snakes), and I recorded them arguing with each other.
At home with my parents...hmmmm, I used to get my hands wet and place them on the wall to make hand prints.
This only happened one time, and I didn't get in trouble, but it was pretty embarassing at the time. I think it's hilarious now. One day I was hanging out at my favorite cousin's house, and I got a wedgie. It was towards the front, instead of the back. I was in the family room, and didn't want to adjust myself in front of everyone. So, I went back into my cousin's room and reached down in my pants to adjust things. Well, my back was facing the door, and my cousin walked in. She was like "eeew, I saw what you did, you nasty little girl!". Apparently, she thought I was in there rubbing one out.
I tried explaining things, but she didn't believe me.