At the end of a play the lie is revealed.

People may or may not say what they mean... but they always say something designed to get what they want. ― David Mamet

All drama is about lies. All drama is about something that’s hidden. A drama starts because a situation becomes imbalanced by a lie. The lie may be something we tell each other or something we think about ourselves, but the lie imbalances a situation. If you’re cheating on your wife the repression of that puts things out of balance; or if you’re someone you think you’re not, and you think you should be further ahead in your job, that neurotic vision takes over your life and you’re plagued by it until you’re cleansed. At the end of a play the lie is revealed. The better the play the more surprising and inevitable the lie is. Aristotle told us this.
― David Mamet

The trick is leaving out everything but the essential. ― David Mamet