Light Bulb - Scrabble Players

Q: How many scrabble players does it take to change a lightbulb?
A: I don't actually know, but it's on a triple word score anyway.

Light Bulb - Futurologists

Q: How many futurologists does it take to change a lightbulb?
A: None. He just takes the old functioning one out when nobody's looking, just to be certain.

Californians Screw in Light Bulb

Q: How many Californians does it take to screw in a light bulb?
A: Californians don't screw in light bulbs they screw in hot tubs.