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Of course. We had a physics teacher – a real character! Unlike the other teachers, whom we constantly made fun of, he was constantly making fun of us! In the very first lesson, he wrote all sorts of mathematical stages on the board, from the lowest to the highest. He explained which stage corresponded to which level of knowledge, and even we, a bunch of goofballs, were interested. Then, suddenly, he drew an arrow from the highest stage to the very bottom, drew a zero, and said, "Right now, we are somewhere in this area." It was hilarious... :)