Here's one spa treatment to never try out! SCARY!

Zhang Nan, a 56-year-old resident of Hubei province, was bathing with live eels, in the hopes that the tiny, serpentine critters would nibble away layers of dead skin, revealing more youthful-looking skin below.

It's similar to those unusual pedicures that have fish eat dead skin off people's feet -- except that you're fully submerged, and you're probably naked, and there are eels all over you.

Anyway, Nan felt a sharp pain, realized a 6-inch eel had entered his penis and was wriggling up through his urethra. He tried to pull it out but its tiny body was too slippery to hold, and it disappeared up his penis and into his bladder