Silent Night, which starts out like a Richard Curtis style comedy about a posh family Christmas, but turns into an example of the sub-genre of apocalyptic films where people come together for one last party before the world ends. It's not bad and if the poshos irritate you, there is the knowledge that they'll all be dead by the end. I can't believe that people would be quite so carefree with the knowledge that they'll only have a few more hours to live. The Australian These Final Hours handled this more believably in that everybody has shitloads of drugs to disassociate, but Silent Night goes more for an arch, stiff upper lip type of British black comedy. Two other similar films I liked are It's a Disaster (2012) and Last Night (1998). This isn't quite as good, but I still liked it's shift from light comedy into something genuinely grim and dark.