Bill Murray appeared on Letterman last night - telling the world that Ghostbusters 3 is his "nightmare" and despite Lee Eisenberg and Gene Stupnitsky having written a script that Columbia and the rest of the cast seem keen on, the idea of a further sequel is "just crazy talk". Hmmm... "crazy talk" that Columbia have spent a ton of money pronouncing so far then? I'm not buying it. Don't worry folks, Ghostbusters 3 is real and happening.Watching the highlights from the video, it's pretty clear that Letterman caught the interchangeable mood swinging Murray on a bad day. Maybe the injury from the skiing accident had something to do with it, or he is simply sick and tired of talking about a film that isn't that much of a big deal to him...