Best animated short film you have ever seen?

[Rev. Rye]

Well, besides the Wallace and Gromit shorts, especially The Wrong Trousers and Close Shave, two films that are about as close as one can get to perfection using only a few tons of plasticine,
There's This:
http://www.youtube.com/watch?v=MuOvqeABHvQ

And, of course, I'll let Christmas come a little early this year and link to The Snowman

And you can't forget these Canadian shorts:
http://video.google.com/videoplay?docid=...3139687271
http://www.youtube.com/watch?v=Wh4DstK2w_Q
I think Frodo got his avatar from the last one

And one more film, the animation really helps bring Norton Juster's second book to life. It's a shame he couldn't do as well for the Phantom Tollbooth.
http://www.youtube.com/watch?v=OmSbdvzbOzY