Twenty. One to hold the bulb, two to turn the ladder, and seventeen on the guest list.
or
It held up a pair of pants.
or
Two. One to assure the everything possible is being done while the other screws the bulb into the water faucet.
or
Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
or
Only one, but she/he'll have to go out and buy the light bulb adaptor card first, which is extra.
or