A chair once fell over on my big toe. It didn't even hurt that much, and it was a really light chair.
After that, during the school lesson, it started to hurt like a bitch. I literally limped home when it was over, and my toe nail was fucking bright blue.
After two weeks, it started hurting, but it became darker and darker blue.
After three or four months, it finally fell off. It was all red and full of dry wound clousure. The toenail quickly regrew though!