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's a dog's favorite food for breakfast?

Pooched eggs.
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What did the flag say to the pole?

Nothing, it just waved.
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H2O is water and H2O2 is hydrogen peroxide. What is H2O4?

Drinking.
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What was the first animal in space?

The cow that jumped over the moon
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This graveyard looks overcrowded.

People must be dying to get in there.
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Which 2 food groups make up Donald Trumps diet?

Meat and Democrats!
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How many skunks does it take to make a big stink?

A phew.
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A Freudian slip is when you mean to say one thing

but you accidentally say Mother.
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What did the carrot say to the rabbit?

Do you want to grab a bite?
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