Hobbes is a stuffed toy tiger (or not) and is also Calvin's best friend - they have lots of adventures together and make some pretty insightful comments about the world in amongst the laughter. Hmm, maybe they are a couple of philosophers after all!
[Hobbes is my favourite, in case you hadn't spotted that...]
My own personal Calvin and Hobbes favourites...
Links to other Calvin and Hobbes pages
The very cool place I found these animations at, JetSwing's Calvin and Hobbes Pages