Lack of good storyline.

if their story seems completely bonkers, almost like a feverish work of fiction, you ain't heard nothing yet.

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.

It really made me laugh, but for some moments I was tearing up because I could relate so much.