Dark humor at its best! I was expecting the final scene as soon as the 'It's all in your mind' notes popped up... intentional clue? Though when he was locked up in a cell I thought that'd somehow be the end of it. Wonder if the imaginary friend is more than just a figment of imagination though... maybe an alien, or a ghost, or something... doesn't seem that imaginary after all. Great work!
-cd-