Light Bulb - Rec.Humor Readers

Q: How many rec.humor readers does it take to change a lightbulb?
A: 565. 1 to put in a trick bulb (say, a flash bulb), 6 to flame the first, pointing out that this bulb is different from the old one, 29 to counter-flame, pointing out that the new bulb is *deliberately* different, and is parodying the old one, 7 to leave the room, citing the extreme density of the 6, 12 to demand that this commentary be redirected to the other room, 14 to ask that the bulb be changed again, since they missed seeing it the first time, and 496 (a bit excessive, but it's not my joke) to climb all over each other, trying to put the old bulb back in.

Light Bulb - Policeman

Q: How many cops does it take to screw in a light bulb?
A: None. It turned itself in.

Rochester Residents to Change Lightbulb

Q: How many Rochester residents does it take to screw in a light bulb?
A: Fifty one - one to screw in the bulb, and fifty to comment about how much better the bulb is than light bulbs in Buffalo.