I also had to be examined, not only in physics, but two auxiliary subjects which I, of course, selected to be mathematics and chemistry. No trouble, except that a good mathematics professor - I forget his name - was absent. And the one who was to take the examination, and that I remember, was named Professor Kobe. There was a story about him, rather generally known. In a company, the question was asked- Which one of those here thinks more highly about himself? And everyone wrote Kobe, with the only exception of Kobe. He wrote- Kobe and rightly so. Well, I went to see him, he looks at me- I never see you in my lectures. I don't quite know how I blushed, how I excused myself. - Well, let's see anyway, what shall I examine you in? Shall we say non-Euclidean geometry? Shall we say this, shall we say that? Shall we talk about the theory of functions? And I more or less, modestly said, in every case- I know a little about it. That went on for maybe five or ten minutes. Then Kobe says- Here you are, you haven't taken one of my lectures. You know a little, a little, a little of this, and of that. And you want to pass your examination? Maybe you even want a good grade. At that point, I clearly remember, I interrupted him and I said- Yes, sir, I would like to have a good grade. Well, that sort of stopped the questions. He said- Well, it doesn't seem to make- make much of a difference for you- to you. I'll examine you in the theory of functions. That was just as well with me, I liked the subject. And then, next time, in the next Tuesday evening, when we part with ping-pong, I told all this to Heisenberg. And Heisenberg laughed and laughed and then he stopped laughing and he said- Now listen. If I say anything to Kobe about you, it's an absolute certainty that you will fail. You'd now better prepare. So I did.