I started a film class today, and one of my professors said that you can do anything you want in the last twenty minutes of a movie. His reasoning was, by that time, everyone is already invested in the film and knows its going to end soon. They also want the conclusion of the story at that time, no matter how much they like it in the first place.
There is a psychological term for this and it's called consistency. It means that if you are forced to do something that is a little outside of your normal character, you will back wards rationalize a reason for why you did it. There was a study done on betting that discovered that gamblers are much more confident that their bet will win AFTER they have placed the bet, than they are BEFORE they have placed the bet. This is their mind creating the feeling that what they did was justified by their character.
The second component to this is commitment. If there has been some cost involved in the action, then the stake in it turning out positive creates the incentive to back wards rationalize... if the commitment is slight, the need to be consistent isn't as strong. This is why fraternity's and sororities have hazing as part of the entrance requirements... it increases the commitment of it's members.
All of this is gone into much more detail in the book,
Influence: the Psychology of Persuasion by Robert Cialdini.
The way this applies to a movie or any other form of story telling is that by slowly increasing the reader involvement with the characters and the development of the story, by the time the story nears the end, the commitment of the reader will be high enough that in order to be consistent with this high commitment, the reader will overlook many things that fly in the face of logic because of their investment in the story.
However, this is NOT a free pass to be completely illogical. Some of the harshest reactions come not from an audience this is let down by the ending to a story that they cared little about, but by an audience that is let down by a story that they cared A LOT for. This is a backlash of their feelings of being involved in the story and it leads to feeling cheated and let down. DO NOT LET THIS HAPPEN! This creates reader resentment, which makes it more difficult to get that reader back for your next piece.
One of the more interesting things revealed in the Cialdini book is that one can increase another persons involvement by getting them to commit to something that they normally wouldn't commit to... like the Chinese having a POW contest to write an essay talking about the great things about democracy, and intentionally choosing the winning essay that mostly is favorable about democracy but is a little bit critical; then getting the winner to make revisions to the essay that are just a little more critical of democracy, and then publishing that essay in the states as the essay of someone who has defected from the US.
Once this happens, it creates the image that the essay writer is a communist and makes it easier to brainwash him completely, since he will now have the image of being a turn coat that psychologically, he will want to be consistent with.
This is called foot in the door, and it means getting someone to invest just a tiny bit to create some commitment and using that to create more commitment, which will make the other person begin to back wards rationalize consistency with beliefs that they normally wouldn't have.
In fiction, this would be the equivalent of beginning a story about an accountant who likes to read the foreign edition of the newspaper, and who also gets strange phone calls in the middle of the night, and who has a business trip scheduled in two weeks to the middle east...
See where that is leading? You can take the most normal character and by slowly adding layers that are incongruent, you can get the reader to buy into each revelation without rejecting it as hogwash, so that when the big revelation comes that is completely implausible, the reader has investment too much not to buy into it (I think the movie True Lies did something similar, but it's been a while since I saw it).
This is a powerful tool for structuring reader involvement and is important to have in the tool box.
- Anatole