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Dudley Moore doing battle with the "Colonel Bogey March". Funny in audio, but a crowning moment of funny in the filmed version when you see his facial expressions as well.
Meta example: In the authorised biography of producer Willie Donaldson, You Cannot Live As I Have Lived And Not End Up Like This, one chapter is given over to a hilarious rant by Jonathan Miller about how Donaldson was a lousy producer who was always trying to screw them over.