My uncle told me a story about when he was a principal of a middle school in Wisconsin back in the 1970's. They used to have a kid poop on the floor all the time. They called him, "The Phantom Crapper" and apparently they never caught him.
Then a few years after the Phantom Crapper was gone, bathroom stalls would start spontaneously falling down when people would use them. They had a new culprit...The Phantom Screwer. A kid would unscrew all of the screws from the bathroom stall and sooner or later, the stall would fall down when someone would go to use it.
They never caught him either. They know he moved on to high school though b/c at a principal's meeting, the local high school principal confided in my uncle that the Phantom Screwer had struck there too!
Makes me wish I had loftier goals in middle school and high school.