In this film, an on-call psychiatrist is assessing a young man who has been referred urgently by his GP. The psychiatrist takes a history in which she elicits persecutory delusions, third person auditory hallucinations, running commentary, thought insertion, and somatic hallucinations. She then makes a risk assessment, takes a drug history and assesses risk.
The patient is clearly suffering from a psychotic disorder and the most likely diagnosis is schizophrenia. Differential diagnoses would include a drug-induced psychosis.
Please note that this video has been made by the University of Nottingham for teaching purposes. The psychiatrist is a real psychiatrist but the patient is played by an actor.