Pessimistic

Q: How many pessimists does it take to screw in a light bulb?
A: None, the old one is probably screwed in too tight.

Light Bulb - Surrealists

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.

Light Bulb - Municipal Employees

Q: How many municipal employees does it take to screw in a light bulb?
A: Seven - two to administer the Civil Service examination for the Light Bulb Administrator position, the Commissioner of Public Works, who ends up hiring his brother for the position anyway, one to plow the mayor's driveway, a Summer Youth student to actually screw it in, and a Union steward to protest that its the electrician's job to screw in lightbulbs.