Q: How many Bush Administration officials does it take to screw in a light bulb?
A: None. There is nothing wrong with the light bulb; its conditions are improving every day. Any reports of its lack of incandescence are a delusional spin from the liberal media. That light bulb has served honorably, and anything you say undermines the lighting effect. Why do you hate freedom?

How many Mac users does it take to change a lightbulb?

• None. A background system process automatically changes lightbulbs and doesn't bother to interrupt the user to tell them.
• One, and the bulb'll last longer. BulbXP had a nasty habit of blowing at the worst time whereas iBulb (or more recently Bulb X) has a longer life.
• Precisely half that of a Windows lightbulb.
• That depends. G5 lightbulbs don't break any more, and G4 lightbulbs used to change themselves before blowing.
• The answer to this question is located in Macintosh HD:Users:Admin:System:Lighting:Bulbs.
• One, and the bulb'll be white and not beige.
• Two. One to install one lightbulb each, which run at a combined efficiency exceeding that of two single bulbs.

More good lightbulb jokes on wikipedia.