A bunch of friends, most of whom sort of dislike each other, try to have a nice and relatively sane dinner party the same night a comet is expected to fly overhead. Unfortunately, the comet screws everything up. Because comets. The lights, phones, and Internet all suddenly stop working. Down the street they can see a single house which seems to still have electricity. Upon more investigation, they discover that it's actually their house, occupied by alternate versions of themselves.