Alfred Hitchcock’s 'Psycho' was a low-budget experiment that became a massive blockbuster through brilliant marketing. Hitchcock insisted on a strict 'no late admission' policy, forcing theaters to prevent audiences from entering after the film started. This created an aura of mystery and urgency. He also purchased as many copies of the original novel as possible to keep the ending a secret. The film's 'shower scene' became a landmark of editing and suspense. With a budget of only $800,000, it grossed over $50 million. It redefined the horror/thriller genre and proved that a director's reputation and clever gimmickry could drive blockbuster-level ticket sales.