Name that musique concrète

Alex Ross links to a video of John Cage appearing on the TV game show "I've Got a Secret" in 1960. He is performing the piece "Water Walk", which uses all kinds of everyday objects, including a bathtub, a vase of flowers, a blender, and a rubber duckie, to create a surprisingly threatening-sounding atmosphere. The audience is in stitches ... I'm not sure if this is sincere amusement or just nervousness. An amazing television event.