Die Hard
Lethal Weapon
Gremlins
Bad Santa

Schwarzenegger + Christmas +1

Arthur Christmas

Bad Santa

Agreed, I have a tradition to watch it at least once during Turner Broadcasting System's annual marathon airing on Christmas day.

I came on this thread specifically to mention "Silent Night Deadly Night" thinking to myself, "no one will have put that down!"

In it's stead I offer up Elf. That isn't my favorite, but all my favorites were already mentioned. Plus that Zoe D. from Elf; she isn't hard to look at.

Scrooged with Bill Murray.

My all-time favorite christmas film as kid was The Snowman although it made me cry the first time I watched it.

At only 26 min. in length it's more of a short film than an actual movie.

http://www.youtube.com/watch?v=cgTpoy91nWo

Well, I thought showing Rare Export's (the two short movies I linked in opening) to my almost 4 years old son - and then thought better of it....atleast few more years i think ;)

Silent Night, Deadly Night

No but seriously, the best ones have already been mentioned.
Die Hard, naturally
Gremlins
Home Alone
Snowman

Nobody mentioned The Muppet Christmas Carol so far? I absolutely love that movie and watch it at my local cinema every year.

For some reason the first 2 trinity movies (My name is Trinity and They call me Trinity)
No idea why :S

AHH! How could we forget!? We should all be ashamed of ourselves!

Santa Claus Conquers the Martians
One of Pia Zadoras 1st movies and one of MST3Ks highest rated episodes.

"The Homecoming" with John Boy Walton and the rest of the good folks on Walton's Mountain. I love this movie.