14. Monsters University
This is the prequel to Monsters, Inc. which is actually set after their time at school. In Monsters, Inc., Mike (voiced by Billy Crystal) tells Sulley (John Goodman) that he’s been jealous of his good looks since they were in the fourth grade, so it’s safe to assume that they acquaintances during childhood. However, in Monsters University, Sulley and Mike meet for the first time. Perhaps university comes right after the third grade in the Monster world.