I think I've told this story on a2k before, but I once spent hours and maybe days on a large, intricate, pencil drawing, something on the order of 3 feet by 4 feet.
Margaret jumped on it and I had her off the drawing in less than a second. I can still see the white scar, about ten inches long, and that was in the early nineties..
On the other hand, the pitting from the drop of hydrochloric acid - not related to a cat episode, just an early chem class - has markedly diminished. I noticed that I couldn't see it any more about ten years ago. So, there's hope for my badge of cat lifting honor.
Adds, reminiscing, my dad had scars on his hand from being "bitten" by a recently dead shark on a boat in the Pacific for the length of his life. What the shark was doing there, I dunno.