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

Only one, but the bulb has got to really WANT to change.
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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 can't hippos ride bicycles?

Bike helmets don't fit hippos
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What do you call a sleeping bull?

A bulldozer
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Why doesn't Donald Trump sweat like Marco Rubio?

Because he has such yuuuuge fans!
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What do Michael Jackson and Malt Whiskey have in common?

They both come in tots.
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How many Iraqis does it take to screw in a light bulb?

It doesn't matter, they don't have any electricity any more.
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What do Santa's elves drive?

Minivans.
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What does cheese say to itself in the mirror?

Halloumi.
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What kind of potato chips fly?

Plane ones.
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