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Ha, I like Brits. There was a story about this British prof that had an emergency and had to be absent for a couple of weeks, and had chosen a grad student to sub in for him. The graduate sub in sat in the last class before the prof left , asked several questions. The prof, feigning outrage, told him: " Ah, if you know so much, why don't _you_ teach the class?" The student replied " Okay", stood up, picked up the chalk and continued teaching the class, and went on to teach for the ensuing weeks.