Alfred Hitchcock said a lot of clever things. So many that today’s “two fer” is a “three fer”:

When an actor comes to me and wants to discuss his character, I say, ‘It’s in the script.’ If he says, ‘But what’s my motivation?, ‘ I say, ‘Your salary.’
Alfred Hitchcock

Television is like the invention of indoor plumbing. It didn’t change people’s habits. It just kept them inside the house.
Alfred Hitchcock

The length of a film should be directly related to the endurance of the human bladder.
Alfred Hitchcock