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's black and white and can't turn around in a corridor?

A nun with a javelin in her throat. (The only joke I can ever recall when asked for one. Told to me by my art teacher in Grade 11. Needless to say, he was my favourite teacher)

Why are jokes in base 8 not funny?

Because 7,10,11!

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Why aren't there any jokes about Jim Jones?

The punchlines are too long.

What do you call an organized group of people waiting to get drinks?

Punchline