How many pessimists does it take to change a light bulb? None - it's probably screwed it too tight anyhow!
Doesn't matter. Lightbulb is going to die anyway.
removed
Because he was afraid of change.
Only one. But they have to sit in the dark room for a year, first, to make sure that the lightbulb is out.
None, they prefer the dark.
Just kidding, you can't change anything in the United States.
One, although it's probably screwed in too tight anyway.
