When I was a kid all the time.
The worst was when me and a friend got jumped. Lost two teeth, broken bones, stitches, the whole nine yards.
Another time I didnt eve realize how badly I was f'ed up. Tried to sneak into the house all cool and collected to wash up, and everyone started screaming. I had blood pouring out of both my ears and didnt even realize it at the time.
After I hit puberty that shit stopped, and I was too big to fuck with. Gotr pounded some boxing, but never lost a fight. One guy almost did. He was whipping me pretty good the whole time, but ended up breaking his wrist on my head.