My nastiest scar and how it happened:
First, it's not really nasty, now it's even hard to see, but if I shave and look in the mirror I see this dark line on the skin above my lip.
It all happened when I was a little baby and my father was washing me in the sink, suddenly I somehow slipped out of his grasp and fell on my face in the sink.
PS: I've also got a scar created by my mother, but that's a different story 😄