"Kilroy was here" meets "Have a nice day"

  
"Kilroy was here" is an American popular culture expression that came into prominence during World War II. It is typically seen in graffiti. Its origins are debated, but the phrase and the distinctive accompanying doodle — a bald-headed man (sometimes depicted as having a few hairs) with a prominent nose peeking over a wall with the fingers of each hand clutching the wall — became associated with GIs in the 1940s and has been re appropriated countless times since.