I've had a few personal ones, but never anything on a larger scale than that.  \n\nThe most interesting one for me was dreaming that one of my friends who I was very close to had a very profane MSN name, and then said something that I found very disturbing, since it was a total perversion of their normal charecter.  The next day, it happened.  It meant a lot to me that I had had the dream, because it felt like a warning - it gave me a chance to think about what I would do if something like that were to happen, and when it did, I felt like I was more emotionally able to cope with it because of the short warning I had been given.