The snowman. I will be 20 this year and have watched it EVERY year since I was 6 years old. Its always on Christmas day. Its a cartoon and I love it, Christmas wouldn't be the same without it.

http://www.youtube.com/watch?v=ponB8Hd_lG4

(You can watch it online ) I think its only on tv in the UK though.

I also love muppets christmas carol! one of the old classics for me. I also seem to watch oliver twist at christmas too.