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.

Tell us what stories have realistic happy endings, or at least ones that don't feel slapped on at the last minute. Remember, a happy ending can be relative. Sometimes just surviving an ordeal is a happy thing, even if you don't get a medal from the princess for it. Books, comics, movies, TV, games — anything goes! Just give us a picture, a video, or a link to spice things up!