Yes Man (2008)

Storyline:

Carl Allen (Jim Carrey) is stuck in a rut with his negative ways. Then he goes to a self-help seminar and learns to unleash the power of yes. Living in the affirmative leads him to all sorts of amazing and transforming experiences; he gets a job promotion, and even finds a new romance. But Carl finds that too much of anything, even positive thinking, is not necessarily a good thing.