David Mandel and Jeff Schaffer, screenwriters of Sacha Baron Cohen's latest film, "The Dictator," were bantering in the comic actor's office as Alec Berg, their co-writer, joined in by speakerphone (he was home babysitting his young daughter). Baron Cohen, star of the prankster mockumentaries "Bruno" and "Borat," was about to move out, and the office was bare except for some...