This joke does not work in print, you have to speak it to someone.
Knock knock.
Who's there?
Helen Keller.
Helen Keller who?
(Don't say anything).
Helen Keller who?
...you will get a laugh...ty.
Helen Keller Knock-Knock
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Explanation
Experiment
Explain Bear
Alright, listen up, genius. This is a knock-knock joke, see? You're supposed to say "Who's there?" Then I say "Helen Keller." Then you're supposed to say "Helen Keller who?" But get this, Helen Keller can't hear or speak, so you don't say anything. It's funny because you're waiting for an answer that's never coming, just like you waiting for your brain to work. And let's be honest, that ain't happening, is it?