When I was still in Prague, one day I received a letter from the police. The state police, which means it's like the KGB. I mean, it was not signed by KGB or something, but I was... from the address I knew where I was supposed to go. I mean it, it was an invitation... you are to come on this hour to this room in this street. I went there. Now, this was obviously very ominous. This was before the Spring... Prague Spring and everything. And I was in trouble with the police already once before. Not only in that with Herzenberg, but then at another time where I was apparently saying things somewhere in the... not in the public, but among friends who were not really friends apparently. And so I was... well, in that case it was actually more dramatic. They just... one day there was a knock on the door and they came and showed me their insignia and you had to come with us. I didn't know... I said, 'Should I take something?' 'No, no, just come. Just come.' And there were two guys and they took me down into the limousine... the blackened limousine like the Mafia here or something. It was Russia-made limousine, and they took me to interrogation. So they interrogated me.  From the way the interrogation was going, from the questions I realized where they had the information and so they kept me. It was like a whole day the interrogation or something. But in the end they let me go. I was still at the university. I expected I would be fired from the university. For some reason I was not, I was allowed to end my studies.