Ben Affleck's full-frontal scene is among the reasons to see Gone Girl, so Conan O'Brien did us all a favor and debuted it on his show. Sorta.

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Affleck promised a lot more than a guy in a penis costume, however. “The penis is in there!” Affleck told MTV. “You have to pay $15 to see it in 3D, [but] it looks better in 3D!”

Well, perhaps not that much more. Mr. Garner was sure to add, “You should know it was a very cold set.”