"Big Fat Liar" is a 2002 American teen comedy film directed by Shawn Levy. The film stars Frankie Muniz as Jason Shepherd, a 14-year-old known for stretching the truth. When Hollywood producer Marty Wolf, played by Paul Giamatti, steals Jason's creative writing assignment and turns it into a hit movie, Jason and his best friend Kaylee (Amanda Bynes) travel to Los Angeles to prove the story is his and seek revenge.