The ba-dum-tss rimshot comes from live comedy, where a drummer in a club or variety show would punctuate a joke with two toms and a cymbal crash. The pattern became a shorthand for a corny punchline and travelled through radio, television comedy and cartoons before finding a second life online. On short-form video and soundboards it is now used as an instant audio punchline, instantly recognisable even without any visuals, which is why editors keep returning to it for jokes, puns and deliberately awkward moments.