Meme magic is real, and it's far worse than I thought it would be.Opening the meme vault was a mistake.
According to one story, it was reported that German intelligence found the phrase on captured American equipment. This began leading Adolf Hitler to believe that Kilroy could be the name or codename of a high-level Allied spy. At the time of the Potsdam Conference in 1945, it was rumored that Stalin found "Kilroy was here" written in the VIPs' bathroom, prompting him to ask his aides who Kilroy was.[1][10]
That cartoon frog is more sinister than you might realize.