My cat tore my lip clean open, I didn't get stitches which was probably a bad idea because there's an obvious-but-thin scar there, so if you're up close it's really obvious. :s
I also got rammed into sideways when playing Manhunt on pavement. forgeted up my elbow really bad. It cracks sometimes.
When I was in preschool, I used to always run up and then down this disabled persons' ramp. The last day, I ran down but I tripped. I tripped and tore open both of my kneecaps. (not the caps themselves, but the skin around them)
I had scarring there until 6th grade. 7 years.