I'll admit it, I cried during pixars newest short film 'lava' a love story between two volcanoes. But I think the best thing about it was the animation, it was really beautiful, my favourite part was the passing of time over the first volcano. I think the best of Pixar is when their animation features on nature, finding nemo for instance is one of my faves. I always enjoy their films more when they stay away from animated people.
The creation of Lava began simply. "I did a little napkin drawing," he says, “with a volcano head on it with a face and it said 'I lava you.' And that was like, okay, there's a song there." Further research and another visit for his sister’s wedding beefed up his idea. "Volcanoes are universal, because the entire world has been created by volcanoes. And what really fascinated me is the underwater volcanoes that you don't really know exist. I learned that there's one called Lōʻihi just off the coast of the big island [in Hawaii]. That just blew my mind, it's going to be the sixth volcano on this giant island. It's going to take 10,000 to 100,000 years to get there.
http://www.wired.co.uk/news/archive/2015-07/22/lava-inside-out-short-film-preview