One of my best friends is also bipolar; I just saw him today! And I think that my boss and good friend probably is bipolar too, but he is undiagnosed (I started a thread on this very topic a few days ago).

I think that all of my close friends have been through MI, most of them have major depression. It's interesting because some of these friendships started before either of us were diagnosed. I guess we just sensed a kindred troubled spirit within each other...