Just two, as long as they can find a way in.
One, but only if the lightbulb really to change.
Well, turns out one is not enough, but if you pair it, two can.
5 1 to hold the bulb and 4 to spin the ladder.
Lightbulb.
edit: i forgot to say please.
His hand caught fire.
All the way
So they won't whistle on the way down.
Flossless compression!
What's up Doc ' Check for bugs in your system.