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I always watch the Alastair Sim Scrooge, although my absolute favourite is A Christmas Carol with George C. Scott, which I used to watch on Christmas Day but have stopped as I didn't want it to become too familiar. I think he's brilliant in it and I like the fact that it's noticeably more scary. The only downside is the daft invented Christmas carol used as the theme at various points.
I've also a soft spot for the Robert de Niro and Meryl Streep film Falling in Love [not exactly a Christmas film but Christmas is a recurring point], which I used to watch as soon as I'd finished work for the Christmas break. I've since stopped, again to keep it fresh next time I see it.
It was quite funny last year, as on Christmas Day I watched Under the Skin (!) and then Skyfall, which I hadn't yet seen and which I enjoyed. Other films I saw were the Dwayne Johnson Hercules which was a total disappointment (the trailer looked fantastic) and the Swedish films The Hunters and False Trail, which were excellent.