am terribly tickled reading about the sort of antics yinjie got up to in his grad student teaching days - it seems that at the first class meeting he would get a friend to impersonate him while he sat amongst the students and made loud obnoxious comments correcting his friend at every turn, and the friend would pretend to lose his temper and snarl: "if you're so smart why don't you teach this class?" whereupon yinjie coolly got up and took over the class. oh boy. wish i could pull that one.