As observed by some doctors, it seems that when a kid lops off a fingertip with a cleaver or car door, there's a chance the end of the digit will grow back. The flesh, bone and nail could return. Researchers have found there's some secret sauce at the nail cuticle that makes this possible.

Chopped: How Amputated Fingertips Sometimes Grow Back : NPR
Since the 1970s, doctors around the world have reported cases in which young kids regrow fingertips if an accident leaves some of the fingernail. Now scientists have figured out how this lizard-like regeneration happens in mice and suspect the same mechanism works in young humans.

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