So this idea of moving seemed like a good way to sort of represent that metaphorically. It also is something for me personally. When I was in fifth grade - so about 11 - my folks moved us to Denmark.

In the end, passion and hard work beats out natural talent.

Dr. Paul Ekman, who worked in San Francisco - still does - which is where Pixar Animation Studios is, he had early in his career identified six. That felt like a nice, manageable number of guys to design and write for. It was anger, fear, sadness, disgust, joy and surprise.

And in part that's good but then, like any emotion - and this is something we learned from the research as well - there are positive and negative aspects to all of these.

Sometimes suffering is a weird attraction.

The drive of the story is sort of hinted at the beginning, is Joy and Sadness and those two characters. Especially Joy starting to understand that there's more to life than being happy. And so that's based on real life observations and things that we've learned as adults.

Well, the film initially - we had decided to pair joy with fear because I don't know about you - for me fear was a major motivator in junior high. So we thought there's probably some good stuff there... As the film went on, we had developed all these great scenes that were really funny, but in the third act, it wasn't adding up to anything.