I have just finished watching this and I am emotionally drained. For those saying this is amatuerish I am sorry but you know nothing about cinema at all. The hand held camera works brilliantly - it lets us into josephs world. The fact that people on the street are staring at him and the camera doesn't matter as they would stare at his behaviour anyway and it adds to the realism and this must have added to the pressure for Ben Wishaw to pull this off. At times this feels like a cruel documentary where the subject is allowed to hit rock bottom for the good of the film. This is stunning. Wishaw should have had an oscar - he has a massive career ahead of him. Give it a chance as it does start slowly but with good reason. Let your self immerse in it and you won't even realise you are watching a movie.

Joseph (Ben Whishaw) works at the airport security checkpoint. He's struggling with mental illness and it spirals out of control.

Full marks for Ben Whishaw's performance. Full full marks. The story could do a bit more dramatic reworking. It needs a more compelling climax. It does get a bit repetitive. Nevertheless, this is all about Ben and he's amazing.

Psychotic; schizophrenic; perhaps autistic behavior leads to bizarre, very antisocial acts. Sadly though the movie makes light of his condition. And, most severely, as the news often presents, is when individuals have access to weapons & people get hurt, die.