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National Lampoon's Christmas Vacation; The Royal Tenenbaums; Christmas Eve on Sesame Street
Three things come to mind:
1) National Lampoon's Christmas Vacation, because I'm American.
2) Royal Tennenbaums, which isn't a Christmas movie but for some reason always reminds me of the Holidays. Something about BIll Murray's blazers and turtlenecks, and Gene Hackman's suit. And I guess Gwyneth's fur coat thing.
3) Christmas Eve on Sesame Street, which is a special that ran in the early-80s at some point. My family watched it every Christmas Eve, a tradition I maintained into my adult life, even before having a kid.