Why are some jokes so funny?

Doctor, Doctor why are some jokes so painfully funny -It must be the punchline

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How do you tell jokes?

Repost :(

What do you get when you cross an apple with a Christmas tree?

A pear. P.s. got this joke in a cracker. If anybody gets it can you please explain it. My family is stumped.

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What do you call a punchline that makes no sense?

A Bobbitt

Why can't a terrorist tell a joke?

They always bomb the punchline!