Years ago, got "bonked" in the mellon by my partner's pencil lead on his backcast...right on the side of my head.
No scars but I was knocked senseless for about half an hour. It was all I could do to stumble around in the shallows like an idiot the rest of the day. Though we both double over laughing now I couldn't quite see the humor that day. It's amazing how much 1 inch of pencil lead can hurt!