What is some of the graffiti you have read in public bathrooms? Don't post the "I hate..." or "for a BJ call..."
Here's samples of what I've seen:

We are the boys from Illinois
We live in caves and ditches
we scratch our ass with broken glass
then laugh because it itches.

****
He who writes on bathroom walls
rolls his shit in little balls
He who reads those words of wit
eats those little balls of shit.