Eerie laughter has no single famous source, but it has become a staple of online horror and comedy editing because a laugh that sounds wrong is instantly recognisable. Creators reuse short, sinister laughs across short-form videos, haunted house montages, reaction clips and Halloween compilations, often to signal that a character cannot be trusted or that a joke has a darker twist. Its staying power comes from that ambiguity: it works as a scare, a punchline and a warning at once, so editors keep reaching for it whenever they need tension without explaining it.