There's a few that I watch, I can't pick just one. XD

Nightmare Before Christmas, the Year Without a Santa Claus, Rudolph, and Frosty the Snowman are all on my 'to watch' list. I know, I'm like twenty-one going on ten, but they're all classics and I still thoroughly enjoy watching them.

I also recently found out that a Nightmare Before Christmas was made in 1993; that mind****ed the hell out of me.