All of them actually . Two to hold the ladder and one to change the lightbulb .
One. He is drunk, and he tells the bulb to screw itself.
One, but the lightbulb has to WANT to change.
One to unscrew it, and one to hold the ladder.
It's no bad luck to walk under a truck.
They wanted to give credit where credit was due.
Babysitter: The fire department put me on hold.
Just one but he wants to do it thirty-two times and when he's done everyone says that his last light bulb was much better.
Why would a blind man need a light bulb?
Let's Google it.