I think that that was one of Feynman's favourite sayings. The Lectures on Physics have that sort of thing in them all over the place.not w/o value I must say. ME texts have the same sort of thing. Too much tenured proff authors for the most part. One must use that sort of exercise sparingly or *VERY* skillfully.
Let me fire up my old TI89 and I'll see what this thing actually looks like. And then maybe I'll measure it to test both me and the theory.
regards,
Douglas