(I'm obviously joking, I took a photo of it just because it had the word "ass" in it even before I noticed the rest of the message)
I always keep an eye out for things that people write and draw on walls as it can often be the most interesting. Take the girls toilets at Sussex University Library: never have I seen such political activism on the side of a toilet roll dispenser in my life. Whoever it is that goes into those toilets armed with a pen and pure passive-aggressive rage you have given me some of the most thoughtful wees of my life.