The German joke, of course. I remember in the same Düsseldorf: I flew through it to Vienna, the border guard asks me, doich or english? I say to him in one phrase that I am a prince, and that I am flying in transit to Vienna for three days, and behind me is my wife, who is not a prince, nor an Englishman.
On what he smiles to me, putting a stamp in the passport, on the purest big and powerful "no, it will be, I will ask her in Russian"))