Light Bulb - Senator

Q: How many senators does it take to screw in a light bulb?
A: Two to sponsor the bill and thirty-three to constitute a quorum.

Light Bulb - Sci.Math Readers

Q: How many sci.math readers does it take to change a lightbulb?
A: Pi. Two hold the ladder, one the bulb, but something irrational remains about it.

Kids Changing a Lightbulb

Q: How many kids does it take to change a light bulb?
A: Three. One to say, "But I never turn it on!" and two to say, "But I did it last time!"