50 Movies Where Evil Won

Plot: Nick Dunne (Ben Affleck) tries to solve the disappearance of his estranged wife Amy (Rosamund Pike), but finds that he is the number one suspect.

Prior to the release of this immensely successful missing-person thriller, it was said that screenwriter Gillian Flynn, who adapted the film from her own novel, had written a different ending. This turned out to be false and, much like in the source material, its villain totally gets away with everything. 

Around halfway through Gone Girl, it's revealed that Amy - who's actually a manipulative, vengeful psychopath - faked her disappearance and is trying to frame Nick for her murder to get revenge on him for cheating on her. Eventually, she decides to return to him and fakes an abduction by a creepy ex-boyfriend, whom she murders.

Once she returns, she impregnates herself with Nick's baby, and he is blackmailed into staying with her to raise their child, ending Gone Girl on a bleak note. The final shot is Amy looking at the camera, defiant, unbeaten, and completely in control, while Trent Reznor and Atticus Ross' atmospheric score plays hauntingly in the background. 

It's debatable as to how well this ending worked. It was anticlimactic, and Amy only really won thanks to the unrealistically incompetent police characters failing to do their job and investigate her story, but it's undeniably chilling. You can always count on David Fincher to turn subpar writing into powerful cinema.