good back-story, and good acting

This is a tender, generous movie that likes its characters and presents them as real people, full of flaws and strengths.

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 the worst ways to make a cult movie is to set out to make a cult movie.