Bone Tomahawk is a great example of this even if not necessary the last 15 min. Most of the movie is a pretty ok western. Bad stuff starts happening and it's still a pretty ok western. Then there is 1 specific scene that goes so hard, you'll want to forget you ever laid eyes on it. Then it's back to western movie but now you have to remember the shit you just saw 🤣
I had to rewind three times cause I swore I kept missing something important that made that significant or something. Needless to say I was glued to the screen until the credits rolled.
While I appreciate your take, I'm just gonna go ahead and recommend people avoid bone tomahawk. It's slow, and at the end of the movie it felt like literally everyone working on the film phoned it in, from actors to the writers.