When you do something wrong, or stupid, or stubborn, and someone else is noticeably aggravated, as in angry enough to get up and physically leave a meeting to avoid saying something wildly unprofessional, it is not considered an adequate apology to state, "I'm sorry that you got mad."
One particular story has stuck with me in the past few weeks:
The gods had condemned Sisyphus to ceaselessly rolling a rock to the top of a mountain, whence the stone would fall back of its own weight. They had thought with some reason that there is no more dreadful punishment than futile and hopeless labor.
Not that I'm frustrated much or anything lately....