Do yourself this favor.

Go here.

Watch the trailer.

There. Now you don't have to waste your time on the actual movie.

Because that's the movie.

Just that. What you just saw.

There's about 40 minutes of decent what-the-fuck? suspense that builds up to that.

And then that. Over. And over. And over. And over. And over.

No, there's no twist. No character development. Nothing else of any remote interest.

Just that.

Then why do so many people like this movie? you ask.

Beats the fuck outta me.