Pain at the Pool
When I was 12, I got in an argument with my dad at a pool. The emotional preteen that I was, I stomped my foot down in anger. Then the pain hit. There was a gap between the cement and where the pool railing was attached to it.
When I slammed my foot down my big toe was forced into the gap. The nail on my big toe had ripped completely from the front and was hanging on by a thread towards the cuticle. My toenail has never grown the same since. Story credit: Reddit/Furbal1307