I lost about 4 nails a few years ago. I was watching a thunderstorm on my porch in bare feet, and the foster kids thought it would be funny to push me out into the rain. They pushed me onto the concrete steps and off came the nails. Gosh it hurt.
They grew back normally, but I was really careful to keep clean dressing over them until they started to come back in.
Those kids would be on muck out duty for a year. LOL