New Book on Nazi-Era Humor: “Did You Hear the One About Hitler?” - SPIEGEL ONLINE:
"Hitler visits a lunatic asylum. The patients give the Hitler salute. As he passes down the line he comes across a man who isn’t saluting.
“Why aren’t you saluting like the others?” Hitler barks.
“Mein Führer, I’m the nurse," comes the answer. "I’m not crazy!”"