I still have a scar on my upper lip from where I rode my tricycle into the coffee table when I was 3.
I also have a small scar at the side of my eye where I was bouncing on a bed, bounced off it and headbutted the corner of a radiator. That one could have been a lot worse.
If you shaved my head you'd find a scar from where I went head first through the bottom right pane of glass in one of those doors with 12 panes in them.
I also have a scar on my hand where I broke a full wine bottle over a tramps head. Not a real tramp mind, it was a movie prop head, I was just trying to trick my friend into believing I had killed a homeless person who had broken into our house and gone to sleep in his bed. That one backfired on me somewhat. He seriously freaked out when I hit the thing though, so it was a successful jape at least.