Every day, buckets of fresh urine are gathered from the schools to boil eggs in to make this much sought after treat. The eggs are first boiled with their shells on in the urine and then with the shells off for about a day and a half. I can't imagine who first come up with this idea, and why, but it does boggle the mind. "Honey - let's boil these eggs in youngest son's pee and see how they taste."
search for century egg at wikipedia!
now if something somewhere on the internet actually said something like what you did at the start of the article without the word "myth" being in the same sentence, you'd really have something.
http://www.shanghaidaily.com/article/?id=466033