Peter Highman (Robert Downey Jr.) is an expectant first-time father whose wife's due date is a mere five days away. As Peter hurries to catch a flight home from Atlanta to be at her side for the birth, his best intentions go completely awry when a chance encounter with aspiring actor Ethan Tremblay (Zach Galifianakis) forces Peter to hitch a ride with Ethan--on what turns out to be a cross-country road trip that will ultimately destroy several cars, numerous friendships and Peter's last nerve.
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