Character Arc Inversion
Taking a character to the opposite of where they started, such as from weak to strong or from decent to compromised. That reversal is what the film is about.
The Treasure of the Sierra Madre
Dobbs is introduced as a likable underdog, and his hardship wins your sympathy. The film then uses that sympathy against you. By the time Dobbs is capable of murder, you have already sided with him. That makes the change more disturbing than if he had been a villain from the start.
Thelma & Louise
Thelma starts as a timid housewife who is too nervous to ask her husband for a weekend away, so she leaves him a note. By the end of the trip she is the one making plans. After J.D. steals Louise's savings, Thelma takes charge and robs a store herself. Louise, who began the trip in control, becomes the one who is shaken.

