One of my gills didn't close before I was born. When I was 7 I had a surgery where they made it 2 parts, looking like a backwards Z, as the scar wasn't growing with me and it was going to cause problems later. The first jokes my family made were about me being attacked by a dyslexic Zoro.
But the best comment I ever got was at a bookstore.
The clerk: I love your scar!
Me: Um, thanks
The clerk: It looks like it could be from Harry Potter
From that point on I decided if anyone asked, I was going to say Voldermort did it.