Open up your eyes and urethras.

I always enjoy perusing the graffiti on the stall walls while sitting in a men's room. AU is not really the best location to do this; the authors don't the creativity of those who scrawl on the stall walls at a place like RISD. Most of it here is your typical assortment of political slogans, slanders against rival fraternities, and crudely drawn parts of the male or female anatomy.
For the life of me, I don't know why they paint over it or scrub it off every so often. It makes sense that there's a major issue with, say, tattooing up the walls of a bathroom in someone's private home. But it's a public restroom for crying out loud. There really isn't even the question of aesthetics to consider when we're talking about a bathroom in the basement of a university building. If you're going to have hundreds of people sharing each other's germs and urinating and defecating within three feet of each other, is it really so bad to make them read each other's misogynist/racist/homophobic/boring anonymous banter?