Tim (Ben Stiller) and his best friend Nick (Jack Black) always share and share alike — until Tim turns down a chance to invest in Nick's latest crazy invention. Now Nick is raking in millions while his buddy is green with Envy. Enter a cagey and conniving vagabond (Christopher Walken) who's got a plan to turn the tables and steer a little profit for himself. Rachel Weisz and Amy Poehler also star in this hilariously dark comedy from acclaimed director Barry Levinson (Tin Men; Good Morning, Vietnam; Rain Man).