I couldn't give away the ending if I wanted to, for the simple reason that I grew so sick and tired of the whole beastly business that I didn't stop to see it. Your edict may keep me out of the theatre, my dear Hitchcock, but I'm hanged if it will keep me in.
Notes from Wikiquote
Films were then shown in continuous performance and it was normally possible to enter or leave screenings at any time. Hitchcock used the publicity tactic of instructing theatre managers not to allow admittance after the start of Psycho. The reprint has some (minor) unacknowledged cuts, but the full original version is "At the Films: Something Nasty in the Motel", p. 19.