Most Helpful Girl
Salo or the 100 days of Sodoma, A serbian film, Ich ne, Ich ne, Contracted, It follows, Cannibal Holocaust, Das Experiment, Funny games.
If you're into psychological thrillers, gore, and virtually disturbing films, those will do.
Most Helpful Guy
Not new ones but The Omen movies and The Exorcist are well known sleepless night makers