Stand by Me
The Shawshank Redemption
The Green Mile
Adaptations of King's work are notoriously patchy, mainly because I think his complex and sprawling narrative and/or characterisation is often times hard to translate to the big screen, but there are plenty of examples of it being done very successful. Carrie and The Shawshank Redemtion in particular are rightly regarded as having terrifically rewarding endings....
In fact, I'd go as far as to say that Carrie is one of my very favourite climaxes to a film - it sends shivers down my spine and the school scenes are oddly satisfying in a kind of visceral way. Plus the fact that it's so very sad.
Carrie is probably the exact opposite of the thread!