Expectant first-time father Peter Highman looks forward to his new child's due date five days away. As Peter hurries to catch a flight home from Atlanta to be at his wife's side for the birth, his best intentions go completely awry. An encounter with aspiring actor Ethan Tremblay forces Peter to hitch a ride with Ethan on a cross-country trip that will ultimately destroy several cars, many friendships, and Peter's last nerve. "Expectant first-time...

Through a series of misunderstandings, Alvin, Simon, and Theodore come to believe that Dave is going to propose to his new girlfriend in Miami, and dump them. They have three days to get to him and stop the proposal, saving themselves not only from losing Dave but possibly from gaining a terrible stepbrother.