"Careful With That Axe, Eugene" is a Pink Floyd song. The studio recording is featured on Relics, while a live version can be found on Ummagumma.
Pink Floyd re-recorded the track for Italian director Michelangelo Antonioni's film, Zabriskie Point. The song is retitled Come In Number 51, Your Time Is Up on the soundtrack album for the film.
The music consists of a light organ based jam (using the "Egyptian" style organ that is so common of Rick Wright in this period) with a segue into the songs only lyrics: the title of the song whispered menacingly, and screams by Roger Waters.
The song was originally released as the B-side of their song "It Would Be So Nice". "It Would Be So Nice" flopped, however its flipside proved to be a popular and favorite Pink Floyd tune.
The song's performance on the "Live at Pompeii" includes the whispered words:
Down, down. Down, down. The star is screaming. Beneath the lies. Lie, lie. Tschay, tschay, tschay. [sound of Waters blowing into the microphone] [light screaming from Waters] Careful, careful, careful with that axe, Eugene. [very loud and prolonged scream] [another very loud and prolonged scream] [Waters blowing into the microphone] [light screaming from Waters] The stars are screaming loud. Tsch. Tsch. Tsch. [low groaning sound from Waters]
Pink Floyd last performed Careful With That Axe, Eugene in Oakland, California, on May 9, 1977, as an encore. It has not been performed since, even during Waters' solo tours or Gimour's solo tours.