Studio heads and their emissaries are often at pains to secure audience-friendly ratings for their offerings, believing that the widest possible audience guarantees the greatest yield. Generally speaking, they are correct, but every now and then a movie comes along that turns such logic on its head. Five years ago, The Hangover came out of nowhere to gross almost $500 million worldwide, with the sequel earning even more. Since then, a number of films Bridesmaids, Ted and The Heat, to name but a few have cashed in on the craze, and more adult-oriented fare now routinely does big business.This year alone, 22 Jump Street and Neighbors (Bad Neighbours in the U.K.) have earned vast sums on relatively small budgets, and The Interview will hope to follow in their footsteps when it comes out at Christmas. Starring James Franco and Seth Rogen, the film documents a TV host and his producer who, under the duress of the CIA, attempt to assassinate North Korean dictator Kim Jong-un. Hilarity must surely ensue. Why the Guardians should be worried: Rogen can take a lot of credit for the potty mouth movement, but The Interview would need to do unprecedented numbers to give Guardians a run. The Interview does have relatively little R-rated competition in the festive season, but mark this under long (long) shot.