An astronomer, a physicist and a mathematician were holidaying
in Scotland. Glancing from a train window, they observed a black sheep
in the middle of a field.
“How interesting," observed the astronomer, "all Scottish sheep are black!”
To which the physicist responded, "No, no! Some Scottish sheep are black!"
The mathematician gazed heavenward in supplication, and then intoned,
"In Scotland there exists at least one field, containing at least one sheep,
at least one side of which is black."
-- J. Steward in 'Concepts of Modern Mathematics'