The ba-dum-tss is a long-running comedy club convention, where a drummer marks a joke with a snare roll and cymbal crash, a cue audiences learned to recognise as the sound of a deliberately bad punchline. It moved from live stages into television comedy, cartoons and online video, where the short sting works even without any visual context. On soundboards and in memes it is now used as instant punctuation for puns, dad jokes and failed attempts at humour, because listeners immediately understand that the joke was meant to fall flat.