A film that makes good use of a Christmas setting tends to explore duality. For this reason, often, Christmas films are films of two halves. A Christmas setting brings with it a set of expectations, and this is a situation that is ripe for subversion. There is a contrast between what Christmas represents to us on the surface and the reality of what it's really like. Family celebration and acts of generosity are the Christmas that gets depicted on a Christmas card. For a lot of us, we're painfully aware of the commercialism of Christmas and how far Christmas has strayed from its religious and spiritual origins. It can also be a time of loneliness and sky high stress levels. So, load up on a festive hamper of hand grenades, and let us pull the pin out for you."
Link to Original Source