None - the lightbulb has the capacity for its own revolution
That's not funny.
None. It will change when the fire nation attacks
One to screw in the lightbulb, stock four carts of supplies, and handle seventeen simultaneous customers at any one time for five consecutive hours.
One to hold the lightbulb, and the rest of the world to revolve around them
They planet!
A pigeon... "Coup, coup"