Actually, my left thumbnail came off when I was 10 because a concrete birdbath fell on it.

Yes, it did look kinda gross when the nail came off. It did hurt while the nail was getting ready to come off, but it didn't hurt as the nail was actually coming off or afterwards. It does take a little while to grow back, like a month or so, but I'll say this, that nail that grew in afterwards is the strongest fingernail of all of them and it grows the fastest.