My fav christmass movie is both somewhat trashy for today's standards and bit less than, well, christmassy; the name is Heavy Metal (Metal Hurlant):
What makes it so special to me is the way I found it; I remember wanting to see this one sooo much as a kid. The scene is early 80s Yugoslavia, communism and stuff, one or maybe two TV channels operating for 7-8 hours total daily, on average one movie per week (Sunday, and after that - Smurfs <3).
My life back then was basically waiting for Sundays. Now, there was a SF/comics TV show with intro made of scenes from Heavy Metal; Of course, I was clueless about the movie name, or even about the fact it's a movie - in my child imagination, it was some kind of neverending cartoon series that I would be allowed to watch every day, not just on Sundays 
...or 
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