Strange things begin to happen when a group of friends gather for a dinner party on an evening when a comet is passing overhead.

Hugh: Yeah, we're in a different reality because the reality where I am from, my best friend didn't sleep with my wife.
Mike: Hugh, do you not understand what I'm saying? This all started tonight, and if there are a million different realities, I have slept with your wife in every one of them.
Mike: No, we're not splitting up. We're just gonna go in two different groups.
Hugh: So, listen to this. This is what he's written. "There is another theory: that two states continue to exist... separate and decoherent from each other, each creating a new branch of reality... based on the two outcomes. Quantum decoherence ensures that the different outcomes... have no interaction with each other."
Mike: If we're collapsing right now, I'm gonna collapse on them. I'm not gonna wait for them to collapse on us.
Hugh: Whoa, whoa, Mike.
Mike: I'll go over there and I'll just kill 'em.
Mike: Let's have a drink.
Hugh: These are Brian's notes from his lesson plan for his class. "Decoherence and Schroedinger's Cat."