Who knock knock joke Knock knock Who is it?

Doctor.** Doctor who **YES**

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Knock Jokes More Knock Jokes

Knock knock. Who's there? Opportunity.

That is impossible. Opportunity doesn’t come knocking twice!

What did the grocery clerk say when he bumped his head when he was in the freezer?

Nothing, he was knocked out .

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What did the doctor say to the Mesothelioma patient?

There's not much I can do, but I'll do asbestos I can!

What on Earth happened?

The doctor said, surprised. "I don't know, it started with a boil on my arse." the frog said.

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Why does America not have knock knock jokes?

Because freedom rings.

Who knock knock joke Knock knock Who is it?

Doctor.** Doctor who **YES**