Calvin and Hobbes animation - YouTube
Christy Rachelle Ford stashed this in Stuff
Calvin and Hobbes, animated. Simply and brilliantly.
Would be wonderful if Bill Watterson would approve a full series of shorts like this.
There's more discussion of the animated gif on Reddit:
From that discussion are the words of Bill Watterson himself:
Actually, I wasn't against all merchandising when I started the strip, but each product I considered seemed to violate the spirit of the strip, contradict its message, and take me away from the work I loved. If my syndicate had let it go at that, the decision would have taken maybe 30 seconds of my life...
This is why (so far) there has been no official animated short.