From Animaniacs, after Wakko has been begging to tell Dr. Scratchansniff a joke and assuring him that it's really funny:
W: Knock-knock! Dr. S: Who's there? W: Max! Dr. S: Max who? W: Max wants to come in and go crazy! Dr. S: ... Okay, now, that's not really a joke, is it, because you see it makes no sense. W: It does if you know Max. Dr. S: But I don't know Max! W: If you did, you'd be laaaaughing!
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W: Knock-knock!
Dr. S: Who's there?
W: Max!
Dr. S: Max who?
W: Max wants to come in and go crazy!
Dr. S: ... Okay, now, that's not really a joke, is it, because you see it makes no sense.
W: It does if you know Max.
Dr. S: But I don't know Max!
W: If you did, you'd be laaaaughing!