Just one. He holds up the bulb and waits for the world to revolve around him.
Seven. One to change it, two to take pictures, and four to make t-shirts for the event.
Tell him the lightbulb is his mother.
It takes four. One to screw in the bulb, and three others to watch and say, "Really dude, you look huge!"
What are you talking about? The bulb is fine.
Because he was dying to do so.
The Mersenne Twister.
Seven. It *has* to be seven.
Artificial Intelligence!
Wait.
It stands on an acorn and waits for it to grow.
Only one. They just hold it still and wait for the world to revolve around them.
He holds the lightbulb and the world revolves around him.