My German professor at U of SoDak was a stereotypical example of stern, Teutonic, German-American discipline and order, one Professor Lipp--reminded my a lot of my Dakota German grandfather and granduncles, except they were nicer.

Of course, in German class, at least when addressing him auf Deutsch, we were required--and felt obviously compelled not to laugh one little bit--to address him as:

Herr Lipp.

Shad