opening sequence

The first shot is on the turkey this shows straight away that its Christmas, This opening sequence is intersting the genre changes throughout, at first it shows an unhappy but wealthy family on Christmas day having their meal it seems serious and there is some tension between some characters. Something is going on between two of the characters that the rest of the family don't about,  Then it turn into a comedy, Santa who isn't real comes down their chimney and kills all of them in different ways.