We open on a single snowflake, drifting gently through a night sky to land on the upturned nose of a child, wearing a bobble hat. Holding a puppy. The music tinkles in: a baby-voiced woman whispers a melancholy cover of Wombling Merry Christmas, at a third of the speed of the original. There are some pan pipes in the background, and the whistling of a winter breeze through some pine branches on a distant hilltop.
Cut to a bevvy of slow-motion women in sequinned cocktail dresses, laughing into each other's hair as they put on lipstick for the office party and open secret Santa presents, all of which turn out to be a loofah set. They are very happy with the loofah sets, and laugh into each other's hair some more. Outside the window, a train travels past. The snow is now thick as a duvet, and yet it is not delayed. It is not First Great Western or First Capital Connect, but a special variety of First Festive Express with nostalgic slam doors and velvet curtains and a toilet that smells of cinnamon whirls.
Cut to the North Pole, where Mrs Claus has been working very, very hard to make Christmas magical for her apparently incapacitated husband and family. Santa and the elves smile vacantly from the sofa while she whirls around in a tinsel haze, prepping sprouts and making nativity costumes and buying the right girdle for Granny and icing the cake and finding the spare batteries and de-icing the car and giving Dasher his antler medication and wrestling a polar bear for the last orange-centered Christmas pudding at the Lapland Superstore, because as we all know, only Mums can do these things without risking serious physical harm. Good old Mums!
Shortly afterwards Mrs Claus will neck a bottle of cooking sherry and slump in a miserable heap under the weight of society's sexist expectation - but it's ok because the advert will be over by then and she can cheer herself up with a nice bit of sale shopping.
Cut to a black forest gateau the size of a paddling pool, over which Olly Murs and someone from TOWIE hold hands and sway, as a Nolan sister plays piano, sitting in the centre of an enormous king prawn ring. Underneath the buffet table, a Furby and a Bratz doll have fallen in love.
The child from earlier arrives at the party, creating a sense of narrative cohesion. The snowflake has melted, but we know it is the same child because the puppy is now wearing the bobble hat. One of the sparkling, laughing ladies puts down their loofah set and scoops the child up in her arms, so that it can place the star on top of the Christmas tree. The Festive Express races past the window, this time drawn incongruously by reindeer. One of the reindeer winks at the puppy. The words [insert heartwarming message] appear on screen, then some small print explaining all items are non-returnable and may cause choking.
Are you weeping yet? Good.