I can't pick a favorite...
I love the animated How the Grinch Stole Christmas (I used a Grinch panel and fabric for my first completed quilt, and my son sang the Grinch song at a recital once). It's a tradition in our family to watch The Best Christmas Pageant Ever every Christmas Eve (or Thanksgiving if we can't all get together for Christmas Eve). I also like A Christmas Story, The Santa Claus, Home Alone, Die Hard, The Nightmare Before Christmas, A Garfield Christmas Special, Gremlins, the Mickey Mouse version of A Christmas Carol...
I've actually never seen Elf, I should try to track that one down this year since I always hear how great it is.
https://www.youtube.com/watch?v=pdjmR8Smzhg