A Funny Story

Q: How many mathematicians does it take to screw in a light bulb?
A: None. It's left to the reader as an exercise.
A: One. He gives it to six Californians, thereby reducing the problem to an earlier joke.
A: One. He gives it to five Oregonians, thereby reducing the problem to an earlier joke.
A: In an earlier article, zeus!bobr writes: