I had a a friend in HS that cut the end of his finger off when it got stuck between the chain and sprocket on a go kart. It severing happened about halfway through the fingernail. Since there was no hope in saving the nub, they just let it heal as-is. His fingernail now wraps over the end of his finger, and we always found it funny to haze the underclassmen at wrestling practice by holding them down and have him tap on their foreheads with his creepy wrap-around fingernail. It wasn't painful, just gross and awkward lol