Big Fat Liar is a 2002 American comedy film, directed by Shawn Levy, written by Dan Schneider and Brian Robbins, and starring Frankie Muniz, Paul Giamatti, Amanda Bynes, Amanda Detmer, Donald Faison, Lee Majors, Russell Hornsby, and Kenan Thompson. The film tells a story about a 14-year-old pathological liar, Jason Shepherd (Muniz), whose creative writing assignment is stolen by an arrogant Hollywood producer, Marty Wolf (Giamatti), who later plans to... see more