One, but the light bulb has to *want* to be screwed in.
He wanted to remain a bat-chelor.
So he could break out.
None, there not too bright with doing anything except showing us where to go when were lost in the dark
It only takes two, but the trick is getting them in the lightbulb.
Three. One to hold the light bulb do and two to spin the chair
To get to the other side
Because they are both surrounded by nuts.
0, the light bulb has to want to change itself.