Why was the vacationing doctor so mad?

He had no patients.
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What is black when clean, and white when dirty?

A blackboard.
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What kind of math do Snowy Owls like?

Owlgebra
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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 girl throw the butter out the window?

She wanted to see a butterfly.
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How many IBM PC owners does it take to change a light bulb?

Only one, but she/he'll have to go out and buy the light bulb adaptor card first, which is extra.
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How many astronomers does it take to change a light bulb?

None. Astronomers prefer the dark.
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How many grips does it take to screw in a light bulb?

Two: One to hold it, one to hammer it in.
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Which reindeer likes to clean?

Comet
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There were two cows in a paddock. One of the cows says, "moo"

and the other one says, "That's what I was going to say."
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