John "Mr. Pixar" Ratzenberger.

While best known for playing blowhard Cliff Clavin on Cheers (1982), John Ratzenberger has also voiced characters in every animated Pixar film. He is even known as Pixar's lucky charm. Writer/producer Andrew Stanton has said that they had such fun with John on the press junkets for the first Toy Story movie, that they decided to work with him as much as possible in the future.

Which of his Pixar characters is the most memorable?

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