Ever wonder what's going on inside someone's head

So did Peter Docter, one of Pixar's earliest employees and the guy behind such classics as "Toy Story," "Up," and the "Monsters Inc." films. For his new movie "Inside Out," Docter takes us inside the human mind, breathing life into the emotions that govern our daily activities: joy, anger, disgust, fear and sadness. It's a unique concept, and one the 46-year-old admitted was not easy to script. 

"The difficult thing on this one was not only did we have to chart the story, but there are two stories going on at the same time — the outside story with Riley and then the inside story with Joy," he told Empire Online earlier this year. "What she does affects the human, and what Riley does affects Joy. But the human doesn't know about Joy; she's just going through her life. I'm not sure we've 100 percent solved it yet, but that's been the challenge, having two stories that affect each other."

In the first full trailer for the film, set during a family dinner, we're given a front-row look at not only the emotions inside Riley's head but also those of her parents. It's a hilarious take on communication in family relationships and instantly makes "Inside Out" one of the more intriguing films of 2015. 

"As soon as we came up with the dinner scene, that set our future, because it really sparked with people," added Docter. "So the idea of being able to go into different heads, that kind of set our tone."

"Inside Out" is set for release on June 19.

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Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Pixar's new movie turns the human brain 'Inside Out'
Animated feature takes the question 'I wonder what they're thinking?' to a whole new level.