Pixar's lucky charm

John Ratzenberger, known to legions of "Cheers" fans as postman Cliff Clavin, is Pixar's lucky charm. He is the only actor whose voice can be heard in all 10 Pixar films:

 "Toy Story" (1995) - Hamm the piggy bank.

 "A Bug's Life" (1998) - P.T. Flea.

"Toy Story 2" (1999) - Hamm.

"Monsters, Inc." (2001) - Yeti the snow monster.

"Finding Nemo"  (2003) - A school of moonfish.

"The Incredibles" (2004) - A philosophical character named Underminer.

"Cars" (2006) - A Mac truck.

"Ratatouille" (2007) - Mustafa, head waiter.

"WALL-E" (2008) - John, a human aboard the spaceship Axiom.

"Up" (2009) - Construction foreman Tom, who tries to persuade Carl to sell his home to Tom's boss, a major contractor who has scooped up all the land in sight.