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A: Knock-knock.
B: Who’s there?
A: To.
B: To who?
A: To whom.
(At which point, someone suggested the rejoinder, “No, I said, ‘Two Who,’ you idiot. It’s Roger and Pete, let us in already!”)
One for the kids…
A: Knock-knock
B: Who’s there?
A: An interrupting cow.
B: An interrupt…
A: Moo!
And the ever-popular…
A: I know a great knock knock joke, but you have to start it.
B: Uh… okay… “Knock knock.”
A: Who’s there?
via Reddit