What is the one thing you most regret doing during your childhood?

Well you were a child then and we cannot undo the past,the birds have long since been gone and no way to bring them back but the fact that you regret it tells me your a person with feelings over remorseful actions. I don't mean to make your question trite but i wish that was the only thing I had to regret. I wouldn't even tell of the stupid things I did as a younger ha!