Only one, but the light bulb has to want to change.
Do you want to be in my Crib Tonight (Kryptonite)
An old man yelling at the cloud
Two. One to change it and one to yell "Ta-daa!" when he's done.
A. Five!...Six!...Seven!...Eight!
Third as many as for a regular bulb.
Four - three to cut a hole in the roof and one to change the bulb.
An offer you can't understand.