I don't know if it's the mischievous sense of anonymity or the human equivalent to a dog marking its territory by sniffing out and pissing on top of another dog's piss, but there's something about scrawling our thoughts on the walls of toilet cubicles that's irresistible to the bar/pub going population. Here's some of the best I've spotted:
"Rock 'n' Roll is our epiphany culture alienation boredom + despair"
"fuck a threesome it's all about a foursome" / "you look like a Joe but you act like a Kevin"
"I think you're hot but I'm too cool to say"
"Davey Cameron is a pie" - "Here we"