Why are some jokes so funny?

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

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What do you call jokes about eyes?

Vitreous humour.

Why do ISIS fighters only drink instant coffee?

Because they hate the French Press. (This joke used to be more topical)

Punchline Jokes More Punchline Jokes

Why didn't the cashier get the punchline?

It didn't register.

What is the deadliest bear?

Seriously... I don't know the punchline to this, help me out.