Californians to Change Lightbulb

Q: How many Californians does it take to screw in a lightbulb?
A: Three - one to change the light bulb and two to say "Oh Wow!"

Light Bulbs to Change Futurologist

Q: How many lightbulbs does it take to change a futurologist?
A: About 6,000,000. You pack them together under high pressure and drop the result from 100 meters on his head. Even if he can predict it to happen he cannot change it, right?

Light Bulb - Canvassers

Q: How many election canvassers does it take to change a light bulb?
A: None. They'd just go round telling everyone that it's time for a change but the only way this can come about is if everyone votes for "New light bulb."