The hit Pixar movie Inside Out was released 10 years ago

A whole decade has now passed since we were introduced to the temperamental emotions inside the mind of an 11-year-old girl in Pixar’s Inside Out.

When young Riley Andersen’s life is uprooted to move with her family to San Francisco, Joy, Fear, Disgust, Anger and Sadness help her navigate the challenges of a new home, school and life all at once.

Voiced perfectly by a stellar cast including Amy Poehler, Bill Hader and Mindy Kaling, the movie was a huge hit with audiences and critics alike thanks to its clever storytelling, unique sense of humour and emotional depth.

With plenty of tear-jerking moments and heartwarming lessons about understanding our feelings, we’re still wondering just who gave a kids’ animated movie the right to be that deep even 10 years later.

To celebrate the beloved animated film’s anniversary, here are 11 behind-the-scenes facts you probably never knew about how it was made…

Inside Out is actually all based on science

For a movie about the neurological complexities of the human brain, it was essential to have some professionals on board.

American professor of psychology Dr Dacher Keltner worked alongside psychologists Paul Ekman and Lisa Damour as consultants on the movie, along with its sequel, which came out to huge acclaim in 2024.

“I’ve taught a human emotion course for 30 years at Berkeley – it’s my pride and joy,” Dr Dacher shared in an interview with Time ahead of the second film’s release.

He explained that director and co-writer Pete Docter had reached out after viewing one of his recordings on the topic. “One day, he called me out of the blue and said, ‘Hey man, I’m thinking about making a movie about emotions. Come on down.’ It went so well that he called me again for Inside Out 2…”

Sadness and Joy embark on an adventure in Pixar's Inside Out

There were a few extra emotions that didn’t end up making it into Inside Out

According to director Pete, there were so many emotions considered at one point that he even wrote an early scene in the film depicting a waiting room for all of them.

“There is no scientific consensus about how many emotions there are,” he told The Hollywood Reporter. “At one point, we fooled around with having 27 different emotions.”

Eventually, though, they whittled it down to the five we see in the finished film.

Inside Out’s emotion characters all had different names at one point

In the version of the film that we know and love, each of the characters are named after their individual emotion that they represent. But there was a time where they had their own names.

According to The Hollywood Reporter, Sadness was, at one point, called Misty, while Anger and Fear were known as........

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