My half-brother dropped me when I was a baby. No scar, but I did end up with a broken leg. Sort of. It was a greenstick fracture and required bed rest.
Forgot about the scar on my left thumb. Nice story that goes with it. Prepare to cringe:
I was in art class, cutting matte board with one of those big tabletop paper cutters. As I line up my matte board and slide it into position, I bring the blade down. Nothing. I bring it down again. The paper still isn't cut. I do it again and again and then press really hard, but that matte board is not cutting!
So, I look down to see what the problem was and I lift the blade.
I had my left thumb under the blade. Immediately, it starts gushing blood, and I calmly walk over to the teacher and tell her I need to go to the nurse, while blood is running down my arm. She looks like she's about to faint, and she sends me and another student down to the nurse.
I show the nurse, and she starts freaking out and is about to call an ambulance. I ask for a Band-Aid, go to the bathroom, wash the blood off, bandage the cut, and then go back to class like nothing happened.