Monsters University

John Ratzenberger makes his traditional Pixar film appearance, reprising his role as Yeti (a.k.a. The Abonimable Snowman) from Monsters, Inc. Yeti's job in the Monsters, Inc. mailroom is a nod to John's famous role as postman Cliff Clavin in Cheers. Yeti warns Mike and Sully that tampering with the mail is punishable by exile to the human world, foreshadowing his exile in Monsters, Inc.