What are the scariest jokes in space?

Knock-Knock Jokes

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What kind of knots only exist in space?

Astro-knots.

What do you call a space alien in a hoodie?

Treyvon Martian

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What does Walter White say when he tells a knock-knock joke?

I am the one who Knock-knocks.

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

A Jehovah's Witness.