What films are considered Christmas movie classics?

The must have Christmas movies of all time are: A Christmas Carol, A Christmas Story, The Snowman, How the Grinch Stole Christmas, Frosty the Snowman, The Little Drummer Boy, The Nativity, The Santa Clause, The Nightmare Before Christmas, Home Alone, Elf, Rudolph the Red-Nosed Reindeer, The Polar Express, The Muppet Christmas Carol, and Charlie Brown's Christmas.