20 Things You Didn't Know About Psycho

Though for decades the accepted length for movie trailers has been around two or three minutes, for Psycho's release Hitchcock cut together a six-and-a-half minute teaser of-sorts.

The trailer was filmed after principal photography was completed and saw Hitchcock take viewers on a tour around the grounds of the Bates Motel and residence, culminating in a glimpse of the shower scene.

But because Janet Leigh wasn't available to shoot this tease, Hitch instead deferred to her co-star Vera Miles - who played Marion's sister Lila in the film - kitted out in a wig to more closely resemble Leigh, while the Psycho typeface obscured her facial features.

Good luck convincing a cinema nowadays to show an almost seven-minute trailer for any movie.