Two. One to change it and one to yell "Ta-daa!" when he's done.
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.
Nun.
Third as many as for a regular bulb.
Well it depends on what you mean by change.
He'd be scratching at the lid of his coffin yelling, "Let me out! I'm alive! Let me out!!"
Have another 80 year old woman yell "bingo!"
One is a cunning array of stunts.