It's a road trip from hell for Robert Downey Jr. and Zach Galifianakis, who team up for 'Due Date' and we have a behind-the-scenes look at the upcoming comedy.
The fun flick, in theaters November 5, tells the story of a soon-to-be first-time dad (Downey) who is so desperate to get home to his wife, who is due with their baby in five days, that he hitches a ride with an aspiring actor (Galifianakis).
"It is such a wild ride, simple in its bones," Downey Jr. says of the movie. "But I think I'm very fortunate that I got to do this with Zach."
Downey Jr. says their first meeting was a bit awkward. "Truth be told, before we started shooting I was in Venice and a weird guy says, 'Hi I think I'm doing a movie with you and Todd Phillips' and I thought, 'I have to punch this guy' and then I realize, oh, that's Zach! So we've definitely come a long way since then."
Galifianakis also has nice things to say about his co-star.
"Robert is really eloquent in real life and his character is really eloquent," he says. "And in real life Robert insults me when we're not working, very eloquently."
Watch tonight's ET for more from the comedic duo!

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