Zodiac

name a scarier line in a film than "mr graysmith, i do the posters myself" AND "not many people have basements in california" no jump scares, no music, no special effects, but just dialogue that makes you suspect that the person you are talking to is the person who killed 37 people and sent a taunting letter to the san francisco police with a code that was hard to guess, even the culprit's was never revealed and entered catch, it's...scary to be honest