I think I'm coming down with something!
or
Two… one to tell the engineer to do it, the other to say "I don't know, what do you think?"
or
Twenty. One to hold the bulb, two to turn the ladder, and 17 to be on the guest list.
or
Lawsuits.
or
A whole synod. One to move that the bulb be changed while the others debate until the room spins.
or