What are the scariest jokes in space?

Knock-Knock Jokes

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What do you call the space between a woman's enhanced breasts?

Ans: Silicon Valley.

Why is the universe expanding?

It needs more space.

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What do you call someone who only tells knock-knock jokes?

A Jehovah's Witness.

What's the worst thing about being a Jehovah's witness?

Nobody asks, 'who's there ' when you try and tell a knock knock joke.