No - but when I was a teen my big toe nail went a nasty colour and puffed up. When I showed the doc this
huge brown and purple nail he said I'd dropped something on it or stubbed it hard. I kept saying, "No, no I definitely didn't - I really would have remembered that!" It eventually fell off

(but grew back fine)
Have you ever walked towards someone in a mall who wouldn't get out of your way, then realised at the last minute it was yourself in a mirror? (Then caught yourself saying "Oh, sorry!" to yourself even though you knew it was you?!)