I had one lecture in one course that was more or less about this; as I recall, one of the first sentences out of the prof's mouth that day was (paraphrased) "Do

I had one lecture in one course that was more or less about this; as I recall, one of the first sentences out of the prof's mouth that day was (paraphrased) "Don't tell anyone it was me who told you this." It was certainly an interesting (if rather depressing) lecture.