American Psycho (2000)

Visible crew/equipment: In the scene after Patrick Bateman's second encounter with the detective in his office, we see Bateman having sex at Courtney's apartment. After he rolls off her, Bateman approaches the large, stand-up mirror in the bedroom. In the upper right hand corner of the mirror, a boom microphone can clearly be seen moving around to pick up Christian Bale's lines. The next time we get the same long shot, the microphone is gone. (00:52:45)

Patrick Bateman: I have all the characteristics of a human being: blood, flesh, skin, hair; but not a single, clear, identifiable emotion, except for greed and disgust. Something horrible is happening inside of me and I don't know why. My nightly bloodlust has overflown into my days. I feel lethal, on the verge of frenzy. I think my mask of sanity is about to slip.

Trivia: When Bateman in the end of the movie confesses his murders to the answering machine, he mentions murders like a man with a dog and a girl with a nail gun. Those are all murders described very graphically in the book.

El Peligro

Question: Did Patrick really kill anybody or was it all in his mind? He killed a homeless man but there's no news report about it on TV. He murders Paul but is told Paul is in London. He severely beat and bloodied two prostitutes but no cops show up to arrest him. He murders Elizabeth and Christie but when he goes back to the apartment later, it is empty and put up for sale.