There is a theory that has been passed between Pixar fans, living online and through word of mouth, but never officially confirmed: All of the Pixar movies actually exist within the same universe.
And while the theory hasn’t been officially confirmed just yet, Pixar did release a video on their Toy Story Facebook page that stoked the flames:
Oh my spurs! You ain't never seen Easter eggs like these, partner. 👀
Posted by Toy Story on Sunday, January 15, 2017
For a deeper dive into the theory of the Pixar Universe, check out The Pixar Theory.