The sound comes from Microsoft Windows, where a short shutdown melody has accompanied powering off a PC across many versions of the operating system. As clips of the chime spread through forums, YouTube edits and meme soundboards, it moved beyond computers and became shorthand for any person, program or plan abruptly stopping. Its familiarity is the joke: almost everyone who has used a PC recognises the cue instantly, so creators can signal an ending, a crash or a mental checkout in under three seconds without any explanation.