Just one. He holds up the bulb and waits for the world to revolve around him.
Zero, because none of them knows how to
They don't: They screw in a vacuum.
It takes two. One to change the bulb and the other to kick the switch.
None. They aren't about to change a bulb when flipping a switch has worked for 15 years.
Hold the door! I'm a leaf on the wind!
Just Juan.
One. ###And it's NOT funny!!!
One. They stick the bulb in the socket and wait for the world to revolve around them!
Please wait...
Because they can't hold it for the next person.
One. He holds it up and the world revolves around him.