It's funny, it's tense, it features two great performances from two actors and the director expertly creates a web of odd tension where you actually don't know what is happening for the majority of the run time.

There is, somehow, an interesting story here, as well as some good acting. There are also some good scenes

Story: It's very simple but honestly that is fine.

It is neither dumb nor smart enough to be fun, and spends way too much time with its boring human characters.