"We went to Downey’s house to have dinner. For some reason, Zach rode his bike. So he arrives 15 minutes late, sweaty, vile, and immediately puts his foot in his mouth by talking about an actress Robert used to date. I laughed, and Zach said, 'You know what, I think I’m just going to go now.'" Director TODD PHILLIPS recalls Due Date co-stars Robert Downey, Jr. and Zach Galifianakis' awkward first meeting.