It's a Wonderful Life. And LOTR (The Fellowship of the Ring). Which is not actually a Christmas movie, but I always watch it around Christmas, so yeah.
Truly a patrician taste you have. Same here, with Die Hard following as a close second. Honorable mentions go to Sylvester Stallone's Cobra and First Blood, surprising how many people forget that those too are set to take place around Xmas time.
Never heard of this! I thought they only had 2 movies (Escape from Guantanamo bay & Going to white castle)!