One, but it takes at least three light bulbs.
Be the change you want to see in the world.
Four. One to hold the lightbulb and three to smoke until the room starts spinning!
One less now, because the one who tried to steal the light bulb was shot by the cops.
One to generate a "ChangeLightBulb" event to the socket.
Go for the juggler
Go straight for the juggler.