A car
or
Holes.
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
Does it have to be a light bulb? I've got this neat candle holder...
or
He was a baaaaaaaaad driver.
or
Because they only know their ABCs "Anybody But Clinton".
or