A crane.
or
A porcupine with split ends
or
Nearly unanswerable, since the one who tries to change it usually drops it, and the others call for a planning session.
or
Because they only know their ABCs "Anybody But Clinton".
or
None. They will never find a bulb that burns as brightly as the old one.
or
Plane ones.
or
Two. One to take notes while the other screws it into the faucet.
or