What did you do while you were a child/teenager that you wouldn't want your own children to do or even perhaps to know about?

There are things I did when I was younger that I definitely don’t want my kids to do and I wouldn’t tell them about unless they asked. Started drinking way too young, there was the time I stole apples from that man’s apple tree, being more sexually active than I would tell them.

Is there anything you did that you would prefer your kids didn’t do or would rather not tell them about?