"Zen And The Art Of Going To The Lavatory" is a 12 volume epic poem in the TV series (it is known as My Favourite Bathtime Gurgles in all versions except the TV series) by Grunthos the Flatulent. Below is an excerpt:
Relax mind Relax body Relax bowels Relax. Do not fall over. You are a cloud. You are raining. Do not rain While train Is standing at a station. Move with the wind. Apologise where necessary.
In a desparate bid to save humanity, Gruntho's own major intestine jumped up the neck and throttled his brain thus killing him.