The clip has circulated as a user-generated soundboard sound rather than a line from a film or television show, with its title and the joke that its creator is not letting them out giving it its identity. Its appeal comes from that simple premise: anonymous, distorted noises from below that listeners can imagine in any way they like. That ambiguity has made it a handy reaction sound for horror memes, prank videos and livestreams, where a few seconds of basement noise are enough to suggest something hidden, trapped or best left alone.