And here, you didn't think Up could get any sadder. OH, BUT IT CAN.

There are some Disney and Pixar theories that, quite simply, blow our minds (Frozen, Tangled and The Little Mermaid are all connected! Boom! Mind blown!). This one is more of an it-was-all-a-dream, whatever-happened-on-Lost sort of deal. But if you want a gut punch right in the feels, read on.

Credit where credit is due: This isn't a particularly new interpretation of the movie (and that's what it is, an interpretation, more so than a fact-based fan theory). It was recently resurfaced by Buzzfeed via Cheezburger, which seems to be adapted from this post on Reddit.