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
A snail because it carries it's home.
or
Because pepper makes them sneeze
or
Don't move, I've got you covered.
or
Can I have your hand, hand, hand, hand, hand, hand, hand, hand in marriage?
or