Are there any happy endings that are completely believable?

I'm one of those people who likes a happy ending, as long as I feel like the story has earned it. But I hate it when creators tack a nice ending onto a story just to make audiences feel good. What science fiction and fantasy stories do you think have the most believable happy endings? Yes, there will be spoilers. » 3/06/14 3:40pm 3/06/14 3:40pm