Kilroy was here! keychain

Kilroy was here is an American popular culture expression, often seen in graffiti. Its origins are debated, but the phrase and the distinctive accompanying doodle—a bald-headed man (possibly with a few hairs) with a prominent phallic nose peeking over a wall with the fingers of each hand clutching the wall—is widely known among U.S. residents who lived during World War II.