Monty Python's Flying Circus Season 1, Episode 4: "Owl-Stretching Time"
In the episode "Full Frontal Nudity" (Episode 8, Season 1) of Monty Python's Flying Circus, produced in 1969, it is "Jerusalem" that must be sung to get a salesman to remove a bag from over his head. The song is also used repeatedly in the episode "Owl-Stretching Time" (Episode 4, Season 1) as Eric Idle sings it from "The Cardiff Rooms", Libya (although he replaces the word "feet" with "teeth"). During the line about "England's mountains green.. " the scene cuts to a "Rustic monologue", which is broken up by the Colonel. Also, in the sketch "Salvation Fuzz/Church Police", when a man is arrested for murder, they "conclude this arrest with a hymn", and they proceed to sing the song. -Wikipedia