Alfred Hitchcock bought all the copies of Robert Bloch’s Psycho, which was published in 1959, in order to keep the plot twists a secret for the film debut in 1960. – WTF Fun Facts
Source: https://variety.com/2017/film/news/alfred-hitchcock-psycho-secret-1202457671/
After every tea Alfred Hitchcock finished on set, he would throw the tea cup and saucer over his shoulder allowing them to shatter on the ground. – WTF Fun Facts
Source: https://metro.co.uk/2015/08/04/15-things-you-may-not-know-about-alfred-hitchcock-5317037/