A Freudian Slip.
One to unscrew it, and one to hold the ladder.
Two. One to hold the ladder and one to screw your mother - I mean light bulb!
A Freudian slip.
A Freudian slip is when someone says one thing when thinking of amother.
They got Napoleon Blownapart! Happy 200th Anniversary of Waterloo everyone!
So that they can't raise it upside-down"