I name the twist...you name the movie.
PLEASE CLICK Comments BELOW TO ANSWER
1 - The Twist: The monsters are the elders dressing up to hide the fact that they are living in a fake world fenced off from modern society.
2 - The Twist: He does NOT have multiple personalities and actually "created" Aaron to fool the court. He knowingly killed the priest.
3 - The Twist: The man on the floor is Jigsaw and he is alive.
4 - The Twist: Malcolm Crowe was shot dead at the beginning of the movie.
5 - The Twist: The mother is Norman in drag.
6 - The Twist: Kint is Soze and the whole story he tells the police is made up.
7 - The Twist: It turns out that that the narrator and Tyler are the same person.
8 - The Twist: He spent ten years carving a hole in the wall and hiding the evidence behind a series of posters.
9 - The Twist: The man who introduced himself as Fenton is actually Adam who is carrying on the mission of "destroying demons." Fenton killed their father, and was the "God's Hand" killer, but Adam couldn't touch him until his name showed up on Adam's list.
10 - The Twist: Grace, her children, and the house staff are all dead. The 'ghosts' that have been supposedly haunting the house are actually living people, who had just purchased the house and are attempting to have them exorcised.
Email me if you have any category requests.
Click on COMMENTS to answer or to see other's answers.
For updates on trivia including new questions and answers, follow me on twitter.