The sting comes from the rimshot drummers played in vaudeville, burlesque and early stand up comedy, where a live band helped time the laughs. Two beats on the drum followed by a cymbal hit marked the end of a gag and covered the pause before the next line. Radio and television sitcoms kept the cue, and it became shorthand for a corny joke. Online, editors reuse the same hit because viewers recognise the rhythm instantly, even without seeing a drummer or a stage.