Psycho written by Joseph Stefano, from the novel by Robert Bloch

Mother: It's sad when a mother has to speak the words that condemn her own son. I couldn't allow them to believe that I would commit murder. They'll put him away now, as I should have, years ago. He was always bad and in the end, he intended to tell them I killed those girls and that man. As if I could do anything except just sit and stare, like one of his stuffed birds. Oh, they know I can't even move a finger and I won't. I'll just sit here and be quiet, just in case they do suspect me. They're probably watching me. Well, let them. Let them see what kind of a person I am. I'm not even gonna swat that fly. I hope they are watching. They'll see. They'll see and they'll know and they'll say, 'Why, she wouldn't even harm a fly.'