Although it has its amusing moments, in eneral the plot does not convince.

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.

One of those movie experiences that is so good it makes you realize you've been grading everything else on a curve.

Exactly the movie you think it is, but not the movie you want it to be.