Smack sounds have long been a staple of comedy sound design, created as Foley effects by striking skin or a similar surface to mimic a real slap. Online, short isolated versions became popular because they are instantly recognisable without any dialogue or context, making them easy to drop into memes, reaction videos and short-form edits. Their appeal has lasted because a single slap carries humour, surprise and embarrassment at once, and it works across languages and cultures without needing translation.