0, the light bulb has to want to change itself.
Nothing. She's fine.
The beam replies: "Oh, just give me a moment."
One, but only if the lightbulb really to change.
One to unscrew it, and one to hold the ladder.
How many libertarians does it take to screw in a light-bulb? None. The market will take care of it.
2...and don't ask me how they got in there. (My 87 year old grandma just told me this one)
You know you need a psychiatrist!
He was bipolar.