Macavity is the mysterious criminal cat described in T. S. Eliot’s 1939 poetry collection Old Possum’s Book of Practical Cats. The character later appeared in Andrew Lloyd Webber’s musical Cats, which opened in London in 1981 and includes the song “Macavity: The Mystery Cat.” The precise recording source of this short clip is not identified, so it is best understood as a brief reference to the character. Online, the emphatic name call remains useful for cat jokes, mock accusations, entrances, and theatrical reveal edits.