Big Fat Liar (stylized as big FAT liar, or bigFATliar) is a 2002 American teen comedy film directed by Shawn Levy, and written by Dan Schneider from a story by Schneider and Brian Robbins. It stars Frankie Muniz, Paul Giamatti and Amanda Bynes, with a supporting cast featuring Amanda Detmer, Donald Faison, Lee Majors and Russell Hornsby.