The One That Got Away.

 The one I couldn't get a picture of, but that I went searching for, only to find that it had been painted over, was "Uncle Methy Says...." followed by some illegible nonsense.

Yeah, I'm going to take the advice of someone called "Uncle Methy"! The best thing about this badly scrawled piece of graffiti was that it had been emblazoned on the side of the defunct local police station.

He probably thought that he had been sending a message of some kind, sticking it to The Man, but by calling himself "Uncle Methy", I think he'd lost any credibility he might of gained with the unintelligible scrawlings after his adopted moniker.