Jon Negroni writes his grand unifying The Pixar Theory:
Every Pixar movie is connected. I explain how, and possibly why. Several months ago, I watched a fun-filled video on Cracked.com that introduced the idea (at least to me) that all of the Pixar movies actually exist within the same universe. Since then, I’ve obsessed over this concept, working to complete what I call “The Pixar Theory,” a working narrative that ties all of the Pixar movies into one cohesive timeline with a main theme. This theory covers every Pixar production since Toy Story.
This blew my mind.