Nun.
Two, but I don't know how they got in there.
5 1 to hold the bulb and 4 to spin the ladder.
Its gonna be a dark four years, now isn't it
Two, but you have to get them in there first.
By holding the bulb up to the socket and waiting for the world to revolve around them EDIT: Rip inbox EDIT 2: Thanks for the gold!
Amburgers & Woot Beer! Edit: Thanks to my dad for this one.
Because he was sheet faced.