This brief vocal comes from Dan Smith, the singer and songwriter behind Bastille, during The Universe Within live stream. In the stream, the single word is delivered live, without studio polish, which is part of its appeal as a shareable clip. Once separated from the longer broadcast, it began circulating online as a compact reaction sound, easy to drop into edits where a spoken response feels more natural than a designed effect. Its continued use comes from that simplicity: one familiar voice, one recognisable moment of surprise, and a tone that fits both jokes and genuine mistakes.