Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
or
Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
or
Two. One to take out the bulb and drop it, and the other to try and sell it before it crashes.
or