I'd have to say Jingle all the Way, too
What more could you ask from in a film? Arnold Schwarzenegger makes the film
"IT'S TURBO TIIIME"
Even though it represents the bad side of Christmas, it's like a cult film, probably because of Schwarzenegger.
This doesn't really count, but it should be the law that you have to watch the Father Ted Christmas special at least twice at Christmas.
Elf is another good one. I kinda have a thing for Zooey Deschanel, the love interest in the film
