Robert Downey Jr., Zach Galifianakis & Todd Phillips' NYC 'Due Date' Premiere

Director Todd Phillips jokes with Robert Downey Jr. and Zach Galifianakis about which one of them "elevates" the comedy in "Due Date" and which one of them "decelerates" it. Plus, are they tired of discussing Mel Gibson's canceled "Hangover 2" cameo?

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