Jackie Charlton and the Tonettes

From episode #24 (first aired 8 December 1970) of legendary BBC sketch show Monty Python's Flying Circus. This band performs "Yummy Yummy Yummy" (originally by Ohio Express) entirely concealed in large wooden packing crates, as the camera pans and swoops as though it was a regular live performance. The crowning punchline of the "How Not To be Seen" sketch.