Because they can't hold it for the next person.
Damn it!
throw a bunch of pocket change in the middle of town. How do u tell who is the richest person in that village? Find the person who gathered the most change.
Those are the wrong Sais
All of them. One to hold the bulb and the rest to screw the world.
A: One. He puts the bulb in and lets the world revolve around him.
Just one. All he has to do is hold it in place while the world revolves around him.
From Jason's Doner Van. (Sorry, I'm guessing this one's only for the Aussies and Brits)