How many mathematicians does it take to screw in a light bulb?

One. He gives it to six Californians, thereby reducing the problem to an earlier joke...

In earlier work, Wiener [1] has shown that one mathematician can change a light bulb.

If k mathematicians can change a light bulb, and if one more simply watches them do it, then k+1 mathematicians will have changed the light bulb.

Therefore, by induction, for all n in the positive integers, n mathematicians can change a light bulb.

Bibliography:

[1] Wiener, Matthew P., <11485@ucbvax>, Re: YALBJ, 1986
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What do ghosts use to wash their hair?

Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
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Why didn't the skeleton cross the road?

He didn't have any guts!
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What's black and white and red all over?

A sunburnt zebra.
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A pair of eyebrows walked into a shop. The assistant asked, "Can I help you?"

The eyebrows replied, "no, we are just browsing"
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Which day do fish hate?

Fryday
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Why do cows wear bells?

Because their horns don't work.

There were two cows in a field. The first cow said "moo" and the second cow said "baaaa." The first cow asked the second cow, "why did you say baaaa?" The second cow said, "I'm learning a foreign language."
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What is a pirate's favorite's fish?

A swordfish
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What is a snowman's favorite breakfast?

Frosted Flakes!
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Why did Venus have to get an air conditioner?

Because Mercury moved in.
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