It is after midnight, and I just arrived home from the supermarket with our Christmas food shopping. As is normally the case at this time of year, the shops are madhouses, packed with the insane and sexually frustrated. At least, this is what I imagine them to be by the looks on their faces, and the way they barge through, or stand perplexed in the isles, like they have survived the first wave of the zombie apocalypse by luck, but their luck won't hold out until the next season.