We had a conference a few years ago, and as we were doing the closing After Action Reviews, most speakers got up and read off a few comments about the conference. But one of our Colonels (of German heritage) had two large posterboards with notes covering specific topics. He introduced himself and said "I know this may seem more formal than some of the other presentations, but as many of you know, my family is originally German, and of course we are known for certain things, like discipline, organization, oh and world conquest!" The crowd burst out laughing, but a succinct summary of your stereotypes. Since I am German heritage myself, I have always remembered that!
BTW, lest we forget the lighter side, his auto license plate was 'EIN BIER'!!