Four - three to cut a hole in the roof and one to change the bulb.
5 1 to hold the bulb and 4 to spin the ladder.
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!
A: Scotsmen don't change light bulbs it's cheaper to sit in the dark
Ticket closed: Forwarded to facilities.
A: One after reflecting in the twilight on the merit of the previous bulb.
A: None: The light bulb contains the seeds of its own revolution.
When the (w)hole job's done.
About 100 French people right now
A fart. It will cut through your pants and not even leave a hole.
Four. One to cut the hole in the ice and three to push the boat through.
The roof.
Someone told her drinks were on the house.
Jose and Hose B.
To keep their pants up.