One. He stands in place while the whole world revolves around him.
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Just one. All he has to do is hold it in place while the world revolves around him.
He holds it up to the socket and the world revolves around him.
They have a photogenic memory.
One narcissist. The narcissist holds the lightbulb in the socket and waits for the world to revolve around him.
One. They just hold the bulb in place and the world revolves around them.
One. But he doesn't screw it in, he just holds it and the world revolves around him.