The following joke is very old (the following version comes from wikipedia).

An astronomer, a physicist and a mathematician are on a train in Scotland. The astronomer looks out of the window, sees a black sheep standing in a field, and remarks, “How odd. Scottish sheep are black.” “No, no, no!” says the physicist. “Only some Scottish sheep are black.” The mathematician rolls his eyes at his companions’ muddled thinking and says, “In Scotland, there is at least one sheep, at least one side of which looks black.”

One skill that mathematicians are encouraged to develop is the ability to precisely formulate ideas, questions, etc., sometimes overly precisely. We have lots of vocabulary and syntax conventions that helps us to draw very fine distinctions.

This is a common point of contention between mathematicians and non-mathematicians when discussing mathematical ideas. Such as, let me think, teachers and students in a math classroom.