It waves.
or
Two — one to change the bulb, and one to write a song about how good the old light bulb was.
or
Well, first let's talk about the concept behind this whole "light bulb" thing.
or
Three. One to climb the ladder while the second kicks the ladder out from under her. And the third to say, "I knew that was too high for you dear."
or
Chile.
or
Dead.
or