In the survival horror video game Until Dawn, the psychopath is a masked maniac who traps a group of friends staying at Josh Washington’s remote lodge. Suffering hallucinations and paranoia, the psycho forces his victims to play twisted psychological games as he brutalizes them.
In Saw, John Kramer is a civil engineer dying from an inoperable brain tumor who decides to help others appreciate the value of life. Instead of giving them a pep talk however, he builds complex torture devices that they can only escape through self-sacrifice. Typical engineer.