This document discusses the BBFC 15 film classification in the UK. A 15 rating allows for strong violence, frequent strong language, portrayals of sexual activity, and brief scenes of sexual violence. Discriminatory language is permitted as long as it is not endorsed by the film. Drug use can be shown but not in an encouraging way. The document also explains why the filmmaker chose a 15 rating over 12 or 12A, as those restrict disturbing or imitable content, and a 15 rating gives more scope to explore the disturbing nature of schizophrenia for a psychological thriller.