I found this on the wall while using the urinal way back in college
Have a booger
Leave a booger
Need a booger
Take a booger
Needless to say there was a whole bunch of boogers on the wall.
And seeing how we were a bunch of idiots, everytime they would paint over it, somebody would start it up again and there would be more boogers. The wall had a very nice stucco look by the time I graduated