Two. Obviously.
Hehe... 'screw' Alternatively: 69, but everyone expects that one.
17, 1 to hold the lightbulb, 1 to hold the ladder and the other 15 to drink whiskey until the roof spins
One: He holds the bulb and the rest of Canada revolves around him.
Just one, but the light bulb is going to need to change itself.
They both like a tight seal.
An iglooser