There's a bit in one of the novels - I forget which one - where Bond uses his Rolex as a knuckle duster. Gave me the heebie-jeebies when I read it.
My worst ding was my first on my first proper watch. About 3 months after I bought it I managed to connect my Reverso with some street furniture - I'm amazed I didn't break the crystal. Quite a ding in the grooved bit on the face, but not nearly as bad as I would have expected from the force of impact. It really bugged me but JLC managed to polish it out really well.