This body, buried in the 1800s, is known as Soapman. Why? Because when re-discovered in 1875, the fats on his body had transformed into soap. How did it happen? Don't click if you have a weak stomach.
According to the Smithsonian, the freak occurrence happened when water and alkaline soil seeped into the man's casket. This turned his fat into one big ol' bar of soap. If you're into science (or watched Fight Club), you'd know it's a type of hydrolysis known as saponification. Even though his body is made from soap, he doesn't really look that clean. [Smithsonian via Neatorama]