One's a spineless, poisonous blob. The other is a form of sea life.
or
I wuv you watts and watts.
or
"A complex world demands complex hair."
or
Three:
One to write the light bulb removal program,
one to write the light bulb insertion program, and
one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time.
or