On his website, Jon states that his theory covers every feature-length movie made by Pixar Animation Studios since 1995. Jon also points out that the whole idea behind his theory, is to have fun and use your imagination while finding interesting connections between animated movies. 

Ready to dive in? Well here we go.

Brave is the first and last movie in the timeline. Obviously, this movie about a Scottish kingdom during the Dark Ages is the earliest time period covered by the Pixar films, but it’s also the only Pixar movie that actually explains why animals in the Pixar universe behave like humans sometimes. 

In Brave, Merida discovers that there is “magic” that can solve her problems but inadvertently turns her mother into a bear. We find out that this magic comes from an odd witch seemingly connected to the mysterious will-of-the-wisps. Not only do we see animals behaving like humans, but we also see brooms (inanimate objects) behaving like people in the witch’s shop.

We also learn that this witch inexplicably disappears every time she passes through doors, leading us to believe that she may not even exist. Don’t get ahead of me, but we’ll come back to Brave. Let’s just say that for now, the witch is someone we know from a different movie in the timeline.

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[Some of you have pointed out that the animals in Brave gradually regress back into an animal state, disproving the idea that this is the source of animals acting like humans. My rebuttal is simple. They regress because the magic wears off. Over time, their evolving intelligence grows naturally.]

Centuries later, the animals from Brave that have been experimented on by the witch have interbred, creating a large-scale population of animals slowly gaining personification and intelligence on their own.

At this point, you probably want to find out a bit more on this theory. You want to understand it and probably share it with some people. If you really are interested in it, you have two options, you can read the full theory by clicking here or you can watch the below video, which also explains the theory in more detail.