An engineer, physicist, and mathematician are on a train going towards Aberdeen in Scotland.
Out of the window, the engineer notices a black sheep on the side of a hill. He quips, "How very strange. Scottish sheep are black!"
The physicist balks, "No, no. All we know is only some Scottish sheep are black."
"You're both wrong," said the mathematician. "In this region of Scotland, there are one or more sheep, at least one side of which appears to be black from here when observed at this particular time from this particular carriage of this particular train."
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