This quote stuck with me over the years from the Disney's movie, The Black Hole, spoken by V.I.N.CENT, the loyal, witty robot (voiced by Roddy McDowall).
Speaking to the ship's first officer about people, V.I.N.CENT said, "There are three basic types, Mr. Pizer: the Wills, the Won'ts, and the Can'ts. The Wills accomplish everything, the Won'ts oppose everything, and the Can'ts won't try anything."
I guess I morphed it some in my mind as:
There are three basic types of people in the world: The Wills, the Won'ts and the Can'ts. The Wills accomplish everything, the Won'ts oppose everything and the Can'ts won't will themselves to try.
(Vital Information Necessary CENTralized)
Occasionally I use this quote in the classroom.
As far as the movie goes? A little campy but good enough that it stuck with me over the years.