A film that exists which follows two people; sane or otherwise, minding their own business. You could view it as a reflection on those little private spurts of madness within any ordinary person's day which allow us to question society's obsession with 'sanity' and 'the norm'.
Alternatively you might have another interpretation. The people in the film will not judge you as you judge them. They are simply existing, as can be assumed… you are too.