anonymous caller

De Palma's thrillers like 'Dressed to Kill' and 'Blow Out' obsessively explore voyeurism, anonymous threats, and the terror of unseen callers manipulating events from the shadows.

Fincher's 'Zodiac' and 'Gone Girl' deeply investigate anonymous communication, cryptic messages, and the psychological cat-and-mouse games between unseen antagonists and their obsessive pursuers.