Hitchcock had a thing for the ladies, and it wasn't a healthy "thing." Even if you don't read anything into the fact that young, attractive blondes were continuously getting slashed, tortured or harassed in his films, his treatment of them off-camera was just slightly less deranged.
For instance, Hitchcock cast an unknown called Tippi Hedren in the lead role for The Birds -- presumably because he knew that a famous star wouldn't be quite as receptive to having massive piles of crap unleashed on her. Bird crap, to be more specific: For five days of filming, Hitchcock would throw live birds directly at the actress, peck, scratch and s**t all over her. Not satisfied with the resulting terror, he ordered that the birds be physically tied to her, and one of them just missed clawing her eye out.
"Can you do that one again?"
All those scenes of the girl losing it in The Birds? She really is that scared, and since this was her big break, she didn't dare saying anything. The whole thing reduced Hedren to tears.
And then things got worse: Hitchcock became infatuated with Hedren, which he demonstrated by paying staff to follow her on her time off and sexually propositioning her (because chicks love guys who throw birds at them). When Hedren refused and demanded to be let out of her contract, the director vowed to ruin her career. And he did: For the next few years, Hedren remained under contract but made no movies. When she was finally released, demand for her had died down, and she spent the remainder of her acting career in relative obscurity.
Today this woman is better known as the mother of Melanie Griffith. Think about that for a second.