American graffiti

The Supermart restrooms are nasty. They reek of a mixture of decomposing matter and cleaning products. The floor is often wet with some sort of liquid, and the paper towel rack is always empty.
But they're also the most entertaining bathrooms in the world. Inside each stall is a huge collection of graffiti. The verity of mediums that vandals use is pretty narrow. The only graffiti that survives is the stuff that can't be washed off, so scratching is popular. Most of the stuff etched into the stall is what you would expect. A collection of various profanities, phallic symbols, and swastikas. But, once past that first layer of idiotic scratching, their is a layer of illegible poems written by angsty goth kids. Under this are just a bunch of personal notes from people, generally using nicknames, with dates. All of this is dwarfed by the block letter message on the inside door, staring at the the minute you sit down. "Look up".