How many bikers does it take to change a light bulb?

It takes two. One to change the bulb, and the other to kick the switch.
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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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Why did the carpenter fall asleep on the job?

He was board.
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What is the difference between a fly and superman?

Superman can fly, but a fly cannot superman!
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What do you get from a bad-tempered shark?

As far away as possible.
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What do lawyers wear in court?

Lawsuits.
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Which search engine is popular amongst mice?

Ask Cheese.
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Who earns a living by driving his customers away?

A taxi driver.
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What do you call a mad elephant?

An earthquake.
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What do you call a baby bear with no teeth?

A gummy bear
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