I have two scars on my face; neither one's very visible anymore. One I received at age three (late 1992), falling face-first into a dry riverbed on my first camping trip. I landed hard, my forehead colliding with a crescent-shaped rock. I remember my father turning me over, my vision going red, the blood flowing into my scleras and pupils. The rock missed my right eye by millimeters. When J.K. Rowling published Harry Potter and the Philosopher's Stone in 1997 my peers began calling me "Harry." Dark-haired, bespectacled, similar scar -- whole package. My comeback: "They should call Harry Potter 'Chris Gorrie', I had the scar first." Not until ten years later, when The Deathly Hallows was released, did I realize Harry was "born" in 1980.
Since Harry was never really born other than as a character in Rowling's mind, I guess that, technically, I still had the scar first.