Laughing Coffin is best known as the name of a player-killer guild in Sword Art Online, a group defined by enjoying in-game murder while other players feared death. That reputation made the name shorthand online for gleeful, villainous behaviour, and clips labelled with it are shared as a reaction laugh for dark jokes and betrayals. As anime edits and gaming montages spread across short video platforms, the sound became a reusable cue for a character who is meant to seem dangerous, unhinged or far too pleased with themselves.