Recently dumped by his wife and stuck in a dead-end job, Carl Allen (Jim Carrey) is a man who prefers to keep himself to himself and, as such, he always says No to every opportunity that comes his way. However, when he's coerced into attending a self-help seminar led by self-proclaimed "Yes Man" Terrence Bundley (Terrence Stamp), Carl's life is turned around. Suddenly he's saying Yes to everything, whatever the consequences, and he's having a ball...