Q: How many safety inspectors does it take to change a lightbulb ?
A: Four. One to change it and three to hold the ladder.

Q: How many sales directors does it take to screw in a lightbulb?
A: (pause) I get it! This is one of those lightbulb jokes, right?

Q: How many heterosexual males does it take to screw in a light bulb in San Francisco?
A: Both of them.

Q: How many schizophreniacs does it take to change a lightbulb?
A: Well, he thinks it's five but as we all now it's only him, so...

Q: How many school teachers does it take to change a lightbulb ?
A: Let's see: 2 A+'s, 3 A's, 5 A-'s, 11 B+'s, 9 B's, 21 B-'s...
A: None. Anything not completed during the lesson is added to the homework.
A: One if at home, but on school time, four.

Q: How many science fiction writers does it take to change a lightbulb?
A: Two. One to screw in the light bulb, and one to say, "In 1876, Jules Verne had the first intimations that electrostatic power was a viable energy alternative. Hitherto, the only sources ..."
A: Two, but it's actually the same person doing it. He went back in time and met himself in the doorway and then the first one sat on the other one's shoulder so that they were able to reach it. Then a major time paradox occurred and the entire room, lightbulb, changer and all was blown out of existence. They co-existed in a parallel universe, though.

Q: How many Scotsmen does it take to change a light bulb?
A: Scotsmen don't change light bulbs, it's cheaper to sit in the dark

Q: How many senators does it take to screw in a light bulb?
A: Two to sponsor the bill and thirty-three to constitute a quorum.

Q: How many seventies disco dancers does it take to change a lightbulb ?
A: Two. One to boogie up the ladder and one to say "Get daaowwwwn !"

Q: How many sheep does it take to change a lightbulb ?
A: Twenty-one. One to change it and twenty to follow him round while he looks for a new one.

Q: How many smokers does it take to change a lightbulb ?
A: At least five. If they all light up together the lightbulb will do so too.

Q: How many social workers does it take to change a lightbulb ?
A: Four. One to remove the bulb from the socket and take it away, without checking whether or not there was actually anything wrong with it, one to accuse its owners of mistreating it, one to find somewhere else to screw it in for the next 6 months, and one to eventually bring it back and say it was all done with the lightbulb's best interests at heart.
A: Four. One to change the bulb, one to counsel the old bulb because it's been thrown away by an uncaring society, one to arrange the case conference and one to make sure they are all following the correct working practice.

Q: How many social scientists does it take to screw in a light bulb?
A: They do not change light bulbs; they search for the root cause as to why the last one went out.

Q: How many socialists does it take to change a light bulb?
A: One to petition the Ministry of Light for a bulb, fifty to establish the state production quota, two hundred militia to force the factory unions to allow production of the bulb, and one to surreptitiously dial an '800' number to order an American light bulb.

Q: How many Stanford professors does it take to screw in a light bulb?
A: One to write a paper claiming that light is a pig whitey invention, one to organize a Darkness Studies program, and one hundred to protest the Diablo Canyon Nuclear Generating Station.

Q: How many Stanford researchers does it take to screw in a lightbulb?
A: Three. One to hold the ladder, one to turn the bulb, and one to bill the government for the house.

Q: How many statisticians does it take to change a lightbulb ?
A: This should be determined using a nonparametric procedure, since statisticians are not normal
A: One -- plus or minus three

Q: How many stock brokers does it take to change a light bulb?
A: Two. One to take out the bulb and drop it, and the other to try and sell it before it crashes (knowing that it's already burned out).

Q: How many surgeons does it take to change a light bulb?
A: None. They would wait for a suitable donor and do a filament transplant.
A: Three. They'd also like to remove the socket as you aren't using it now.

Q: How many surrealists does it take to change a light bulb?
A: Two. One to hold the giraffe and the other to fill the bathtub with brightly colored machine tools.
A: Two. One to change it and one to throw a bucket of water out the window.