In my early 20’s.
Here’s a good one. I was walking down the sidewalk with some friends and there was this shed on someone’s property right along the sidewalk with a really cheap looking old window, really thin glass. And I was like “I bet I can punch through that window”, and just punched through that window.
I only know the details of this event from what my friends told me the next day, because I lost so much blood I only remember a few seconds here and there. The window always wins in the end.