Robert Downey Jr.: Zach Galifianakis Who?

Robert Downey Jr. admitted that he didn’t really know who Due Date co-star Zach Galifianakis was when they first met.

When the famed comedian approached him on the street, excited to meet his new co-star, Robert says “Susan my wife was there and was worried for me. I tend not to recognise people. I didn’t know exactly who Zach was yet.” He joked: “I looked like I was going to drop him on the pavement.”

RDJ have you been living under a rock?!

But fortunately, the two developed a great onscreen chemistry and appeared chummy at the London premiere of the new film last night. The secret? “Insults, insults, insults,” Zach said.