None. Light bulbs don't change anything.
They are both being screwed by a person named Kim.
Darth Vader.
He needed to see if how fast his grade dropped broke any laws of physics.
None, they'll just keep complimenting it and get mad when it doesn't want to screw.
One. He holds it up and the world revolves around him.
It doesn't matter, they all turn them the the wrong way.