Two: One to change it, and the other one to change it back again.
None, because they keep on asking why all of the other light bulbs in the house aren't being changed at the same time.
One. They're efficient and don't have humour.
She doesn't, she just holds it in the socket and waits for the world to revolve around her.
Twelve. Three to Physically Change the Bulb, Three to Talk About How Complicated it Was and Six to Call themselves Electricians.
Because I don't joke about jokes.
Just two. One to explain to the public that everything possible is being done to solve the problem, and the other to screw the lightbulb into the water faucet.
