The German Maternity Ward Joke

I recently heard a joke about a mix-up in a German maternity ward in which the doctors could not identify which newborn was German, which was Jewish, and which was Turkish. When I told the joke to a professor of History, he laughed but told me that he would never repeat that joke in front of a class, and he advised me against posting it on my blog. With that in mind, the German maternity ward joke is available only upon request, and only with a specific waiver that recipients will not pitch a PC hissy fit.