9 Seriously Smart Movies That Trick You By Having Two Twists

9. Leonardo DiCaprio's Insane (Or Is He?) - Shutter Island

The Movie: After finally bagging his Oscar with The Departed, Martin Scorsese chose to do something a little different, adapting Dennis Lehane's period mystery novel about a detective investigating a mysterious island asylum in the 1950s. The result is both a throwback B-movie and tight psychological thriller that probes the spectre of guilt and the trials of war.

The First Twist: There's a lot of uncertainty about the true nature of the asylum and the investigation, and at the end we learn Leonardo DiCaprio's Teddy was right to be suspicious. When he arrives at the lighthouse, the key to everything going on at Ashecliffe Hospital, he's told by Ben Kingsley's Dr Cawley that he is in fact an inmate, with everything we've seen so far a role-play in an attempt to shake his belief he's actually a cop investigating the island and address his dark past. Sadly it doesn't seem to work, leaving the doctors with little choice of what to do with Teddy.

The Second Twist: The final scene puts everything we've just been told into doubt; Teddy says to his doctor "Which would be worse: To live as a monster, or to die as a good man?" before walking off to be lobotomised. A shock even for those who've read the book (the line was written for the movie), despite appearing to have regressed back into his delusion, the trick did work and Teddy's fully aware of what he's done, but feeling guilty for his past crimes is overwhelmed by a desire to atone for his sins.