Well, I know and have met quite a lot of celebrities and royalty, but I suppose that doesn't count as an unexpected encounter. Still, I have a few good ones. - When I was a little kid I was at a party and Karl Lagerfeld was there. I apparently screamed and cried upon seeing him, and I can understand why. - When I was 12 I was walking down a street in Johannesburg with my father and a friend of his, when we saw a crowd. We approached it, and in the centre was Nelson Mandela. We shook hands (naturally, the South African way) and exchanged a couple of words. This is unquestionably my favourite, although I'm not sure if he's a celebrity. - A couple of weeks ago Pierre Casiraghi punched me in the face, leaving a black eye for a whole week. To be fair, I already knew him, but it was funny regardless.