The "Cheese Shop" is a sketch from Monty Python's Flying Circus.[1][2]
It originally appeared in episode 33, "Salad Days" on 30 November, 1972. The script for the sketch is included in the 1989 book The Complete Monty Python's Flying Circus: All the Words, Volume 2.[3]
It was later reworked for the album The Monty Python Matching Tie and Handkerchief and appeared for one last time during Monty Python Live (Mostly), as a surprising coda to the Dead Parrot sketch.
Perhaps the gag par excellence of the Python public service encounter archive is the so-called "cheese shop" sketch.