Lord Voldemort is the main villain of the Harry Potter books and films, portrayed on screen by Ralph Fiennes in the later films, where his cold, triumphant laugh became a signature of his menace. Clips of the laugh spread through YouTube edits, TikTok videos and soundboards as a shorthand for evil plans, scheming and dramatic reveals. It remains popular because it is instantly recognisable even without dialogue, works in both scary and comic contexts, and gives creators a quick way to signal that a character is up to no good.