Be sure to read through the captions on the images at Environmental Graffiti - the delve into some interesting details about toilet nicknames. Why do the Brits call it a "loo"? Read caption nine. Who was the original "John"? Check out number 14. And don't even get me started on Thomas Crapper (number six).
Now you can soak up some nature while answering the call of nature!
See them all: Environmental Graffiti
(Images: Environmental Graffiti)