Does it have to be a light bulb?

Q: How many Supreme Court Justices does it take to screw in a light bulb?
A: Nine-three to form a plurality, two to concur in part, two to dissent one to concur in part and dissent in part with the plurality opinion, and the last to concur with the dissenters in part.

Q: How many Japanese industrialists does it take to change a light bulb?
A: Three–one to make sure the new bulb is not foreign, one to change the bulb, and one to look into the export potential of the old bulb.

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 …

Q: How many accountants does it take to screw in a light bulb?
A: None–just assume its changed.

Q: How many BASIC programmers does it take to screw in a light bulb?
A: 10 push bulb upwards:twist bulb clockwise 20 goto 10

I heard this on Dave Broadfoots monologue on Air Farce today:

Q: How many Canadians does it take to change a lightbulb?

A: None. Canadians dont change lightbulbs, we accept them as they are.

Q: How many Borg will it take to change a light bulb?
A: None, they just assimilate the bulb.

Q: How many Germans does it take to screw in a light bulb?
A: None. They assign the task to a gastarbeiter.

Q: How many copyeditors does it take to screw in a lightbulb?
A: The last time this question was asked, it involved art directors. Is the difference intentional? Should one or the other instance be changed? It seems inconsistent.