The twirling moustache villain is a long-running stock character from melodrama, cartoons and pantomime, usually shown scheming in secret while stroking his facial hair. Online, that image became shorthand for obvious, theatrical villainy, and this laugh became the audio version of the joke. Creators pair it with raised eyebrows, rubbing hands and dramatic zooms to signal a plan is underway. Because the performance is so exaggerated, audiences recognise the trope instantly, and the sound now appears across meme edits, short videos and reaction posts whenever someone pretends to be the bad guy.