Stop in for a cup of coffee

Found this
The origin of the phrase "Kilroy was here" is uncertain, but some historians point to James J. Kilroy, an inspector at the Fore River Shipyard in Braintree, MA, who supposedly wrote the phrase on various parts of ships as they were being built1. Others suggest that the phrase was borrowed from British cartoonist George Chatterton's character Chad2. The phrase became popular during World War II and was often combined with Chad's image34. The graffiti followed US soldiers across Europe and eventually became a popular symbol across the US5.