What?!?!? No horse pee pee? http://en.wikipedia.org/wiki/Century_egg It is no wonder that this is a persistent myth. Back in college I had a friend from China whose father owned a restaurant, and even he said that this was how the eggs were made. It must be a favorite story used to freak-out the westerners. It was always a treat when we had our Saturday study sessions. His father would send a box full of dim sum. Mmmmmmm! He threatened to bring some thousand year eggs but never did.