Kitler is a long-running internet joke about cats whose dark facial markings give them a passing resemblance to a historical dictator, a comparison that spread through cat meme pages and photo collections because it is both instantly recognisable and deliberately absurd. As short video culture grew, the joke moved from still images into soundboards and reaction clips, where a brief audio cue could signal the reference without a caption. It survives because the humour relies on visual recognition rather than a topical news reference, so new cat photos keep the format fresh for each generation of viewers.