Leonard Nathan, "Bladder Song" from The Day the Perfect Speakers Left (C)1969 by Leonard Nathan and reprinted by permission of Wesleyan University Press.
On a piece of toilet paper
Afloat in the unflushed piss,
The fully printed lips of a woman.
Nathan, cheer up! The sewer
Sends you a big red kiss.
Ah, nothing's wasted, if it's human.