"Janitor" joke

At Carnegie Melon University:

On the first day of a semester, Professor Artman, clad in his usual flannel shirt, work pants, and boots, was cleaning the blackboard. Two freshmen entered his classroom and took seats. After he finished and without saying a word, Artman proceeded to write out a series of equations for his upcoming class.

One student looked at the other and said, "Wow, this is a tough school! Look, even the janitor knows calculus."

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