My favorite scar is a long raised white line on my left thumb. It used to go halfway up my forearm, but has faded.
Angela and I were holding a huge longhaired cat for his nail trim. He got a un-pedicured foot out of our grasp and kicked. His nail went up the length of my arm in a beautiful straight line. We finished his nail trim without further event, and I have the scar to show for it. I love it.