I love every scene with the Bumble in Rudolph, and when Frosty first comes to life.
Santa Claus is Coming to Town is my favourite Christmas movie but I can't think of a particular moment from it.
I also love the Ghost of Christmas Present from The Muppet's Christmas Carol.
"You're a little absent-minded, spirit."
"No, I'm a large absent-minded spirit!"
Bwahaha.