As a young teacher, I had the responsibility for deciding the content of the weekly schoolwide assemblies. In one of those, I showed a film about the Holocaust. While it was showing, I remembered we had a German exchange student at our school. I was mortified by my insensitive mistake. I went to her immediately after the movie to apologize. But her reaction was no reaction at all, informing me that the German schools start talking about and analyzing the Holocaust at a very young age. Took a big chunk out of my American ego.