An engineer, a physicist, and a philosopher were hiking through the Scottish highlands. Coming to the top of a hill, they saw a solitary black sheep standing before them. The engineer said, “Remarkable! Scottish sheep are black.” The physicist said, “Strange! Some of the sheep in Scotland must be black.” The philosopher said, “Um. At least one of the sheep in Scotland is black, on one side anyway.”
From the Science Jokes page of Mr. Kevin A. Boudreaux, Instructor, Department of Chemistry at Angelo State University in San Angelo, Texas.