Three. One to hold the light bulb and two to spin the ladder."
Only one but he has to manufacture it first.
A: None: Leos are so enthusiastic they carry their own light.
Four - three to cut a hole in the roof and one to change the bulb.
Only one, but the light bulb should be willing to change.
A: Cos they've no idea of the route.
A: They're both empty from the neck up.