Exactitude

I don't like vague answers, or history revisionists. If something is true, say it as such. Do not alter the facts to make your point, you will only confuse, annoy, or anger your students.

Case in point: When trying to show, as an example of leaders who go to war for defensive reasons, to protect their own borders, don't name, of all people, Hitler! And don't go specifically stating that "Hitler wanted to take over Europe, right? And eventually the world. This was to ensure the protection of Germany's security."

Taking over the world is in self defense. Oh, of course. Not insane overblown nationalistic megalomania, xenophobic racist hatred for anything "other", even a messed up childhood or something- no, no, certainly not. How could anyone ever think otherwise.

I never imagined anyone could say anything like that while conscious! Needless to say this is no longer a class that I'm taking.