I have 6 scars (4 of which are prominently noticeable) on my right hand from when a dog attacked me as a toddler. I required a lot of stitches for that.
I also have a scar on my right elbow, from several incidents which simply resulted in it getting larger with each subsequent injury. The original came from falling onto concrete, and it got bigger when I attempted skateboarding.
Both of my kneecaps are scarred (from attempting to ride a scooter down a steep paved hill), along with several others on my forearms. I also have a scar on the back of my head, from a rather nasty fall I took onto the edge of a table, which required stitches and hospital treatment.
I have a scar on my nose from my brother, and two (barely visible), from when a jerk at summer camp though it would be funny to hit me across the face with a broom, while I was wearing sunglasses. (I promptly took the broom from him, then broke it over him...)