Q: How many Union Electricians does it take to screw in a light bulb?
A: Sixteen - One to give the bulb to the screw-inner. One to screw in the bulb. One to hold him on the step ladder. Four to hold the step ladder steady. One to flick the switch to test the bulb. One to make sure that the other bulbs in the room will need fixing. One to supervise. Two to take a coffee break, one to eat lunch, and one to nap and one to plot the best way of breaking into the apartment at night.

Q: How many university students does it take to change a lightbulb ?
A: Two. One to fuse all the electrics while doing something silly, and one to phone the landlord to ask for the lightbulb to be changed.
A: 31. Ten to vote on whether the light bulb needs changing, whether they should join the Lightbulbs Union first and then what to call the new lightbulb, one to put it in... and twenty to have a party after to celebrate a good days work...

Q: How many US Presidents does it take to screw in a light bulb?
A: None, the constitution says that only Congress can screw in light bulbs, so only Congress is responsible for the dark, which is why we need a Constitutional ammendment.
A: Only one. If he can handle 250000000 people a day I think he can handle screwing one extra lightbulb.

Q: How many utilitarians does it take to screw in a light bulb?
A: As many as are happy screwing in light bulbs.