The worst toilet I ever saw was in China, but at 5000 meters in Sichuan, it was two slippery two by fours that you had to straddle on over a big open pit (don't slip or lose balance!).

That was such an awesome trip circa 2005.

Well the worst one I ever saw was in New York City, of all places.

My favorite was a place in Chinatown with a curtain for privacy. Outside a couple of guys where killing a seemingly limitless collection of lives chickens.