If you lived in Ancient Greece or Rome, you might be hanging out in a bath of crocodile feces and warmed mud. Yup, croc poop. At that time, people believed that crocodile excrement could dramatically slow down the aging process. And don’t forget those poop masks! Aristocrats often made face masks from croc dung. Super gross! There is one upside though: Unlike all the other beauty tips mentioned, no one died from bathing in these poop baths.