I had to explain to my wife who "Kilroy" was. My dad, being in the Army for the better part of his life, would from time to time mention the name Kilroy. I asked him one day who Kilroy was. Well, a few years later, my dad was talking with the TV repairman and the TV guy said that he had to take the set into the shop. Dad said that maybe Kilroy could fix it. The repair guy asked dad who was Kilroy and he told him, but the story had changed. This bothered me off and on for maybe a month and I asked Dad why did he tell me a different story of who Kilroy was from what he told the TV repairman. He told me to "Stand Down" I was maybe only about ten at the time and I didn't know what that meant either.
Fast forward to 1970, we were walking into a bar in Saigon and on the side of the door was a sign that read, (you guessed it), "Kilroy was here." I said to my buddy that was with me that I didn't know who this guy Kilroy was, but he sure gets a round.