When I was little, younger than 7, and had gotten really angry with my sister, I would take her toothbrush and wipe it on my dogs butt. Until now, I haven't told a soul.
When I was younger me and my cousin thought that it would be cool to learn how to kiss. We were only like 5 and we didn't want to get in the situation with a boy and not know what to do. So what do we do? Start making out under my back porch. My mom walked outside to see us. She didn't even know what to do, so she just walked back in.
One time I was at the train station with my little brother. He saw a brick wall and thought it was the passage for Hogwarts. He ran into it, hit his forehead and started bleeding. I decided to cover his stupidity and told my parents that someone accidentally pushed him. To this day only my brother and I know.