Saddest ending ever!
I really liked this movie, it was a somber, moving fantasy drama. I'd agree with others here about the emotions evoked by this film.
That said, of all the movies I've seen this film certainly has the saddest ending. At the end Fluke realizes how he wasn't a very good father, and concedes that he would get in the way of his family's happiness if he stayed with them, so he must go away. It's just so sad that he had to leave behind his family.