I heard this on a David Frost show from the 60s. It’s got me wondering who was the first comedian to use this joke form.
closed as off topic by Jim, tchrist, Matt Эллен, Mitch, Carlo_R. Oct 10 '12 at 18:50
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Groucho Marx used to use this phrase. For example, in A Night in Casablanca his character said, “I’ve seen five o’clock shadow, but this is ridiculous!” Don’t know if it originated with him or not, though.