None. They just let Marketing explain that "Dead Bulb" is a feature.
or
Finding a cabinet position for the thing on his head!
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
Three, One to climb the ladder. One to shake it. And one to sue the ladder company.
or