I love the ending of Room 1408
Room 1408 is one of the first horror movies I've seen that ends this way. Instead of being completely defeated by the Room's fear tactics and psychological attacks, John Cusack's character reaches a point where he's just fed up with it. He burns the Room down, and when the Room "cries," he snaps back with lines like, "Keep quiet, you bastard," and "You're wasting your time." I was laughing at how pathetic the Room's attempts to scare him became.
What makes the ending so satisfying is how the Room loses control once anger replaces fear. By the end, Cusack's character is so furious that every scare tactic just makes him more pissed, so instead of fear consuming the victim, the victim turns that rage back on the Room and burns the motherf***er down. Watching the Room become desperate and ineffective was genuinely hilarious.
In a way, the ending feels like the reverse of Yoda's philosophy:
"Fear leads to anger, anger leads to hate, hate leads to suffering… for the Room."
Yeah, I know 1408 has multiple alternate endings, but the theatrical ending is still one of my favorites because the demon, or whatever eldritch force controls the Room, ends up completely humiliated by its victim.
I wish more horror movies ended this way.