Short knock knock jokes have stayed popular on soundboards because the format needs no explanation and fits into a few seconds. This Arnold version circulates as a user-uploaded meme clip, passed around for prank edits and reaction videos rather than tied to a specific show or film. Its appeal is the instant setup-and-payoff structure, which works in compilations, gaming highlights and short-form sketches. With under three seconds of audio, it slots easily between dialogue without derailing the pace.