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
Through the engineers.
or
Two, one to call Daddy, and one to get the (pick one:) mineral water/Tab.
or
I dot my i's on you!
or
and says make me one with everything.
or