Has to be one of the best animated movies ever - in terms of idea, content and presentation. A rather good example of gamification, presenting very complex ideas in a lucid, fun and engaging way. I don't want to discuss the story here, because I won't do justice to it.
All I can say is, whether you are a kid or an adult, go watch Inside Out! And rediscover so much about yourself, you will feel like a whole new person!