Anything that takes place during the Christmas holiday season. Simple as that. Sci fi and fantasy accepted.
It's not a Christmas movie, but you said "Christmas holiday season", and any chance to enter a 12 Monkeys av... (This was the only image I could find online with Christmas imagery, and I didn't feel up to digging out the DVD and making my own capture. Sorry.)
Can I take it that the Like you gave, means that you finally saw the film? It's a classic, like "The Princess Bride", "Ghostbusters" and "Ferris Bueller's Day Off" -- you can't go wrong seeing it. If anybody wants to use an image I submitted to an old contest, of Eddie in a Santa suit from "Fraiser", let me know and I'll post it.