Just one, but the light bulb really has to want to change.
Five. Germany to start it, France to try and then give up almost immediately, Italy to start, give up, and try again from the other side, America to finish it and claim credit for the whole thing, and Switzerland to sit in the dark and pretend that nothing happened.
None. They wait for the electrician to make a mistake and yell at them for doing it wrong.
Two. One to hold the light bulb and one to drink until the room spins.
A: None: The light bulb contains the seeds of its own revolution.
He was having problems with his sub-conscious.
