This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Nosferatu
He is coming...
From the 1922 film
For something nearly a hundred years old, this film has aged surprisingly well, especially in regards to Max Schreck's performance as Count Orlok.
A famous scene: Hutter opens his chamber door and sees Orlok standing, dead eyed at the other end of the hall. He closes the door in fear, and finding no way to bar it, cowers in his bed. The door opens seemingly of its own accord, before Orlok emerges from the darkness, and stiffly walks into the room.
The scene where Orlok is peering from behind the window of his house. It still has a scary feel to it and inspired countless similar scenes in horror films ever since.
The crawling shadow of Orlok has been copied to death, but the one that started it all? Still terrifying.
The massacre on the ship, where Orlock slowly destroys each crew member before sliding into the port. Culminating in the moment where Orlock rises from his coffin to finish off the last crew member. He doesn't climb out, he levitates ninety degrees to a standing position without moving a muscle. It's very surreal and very creepy.
Orlok's creepy, desolate castle in the middle of the Transylvanian countryside. The outer gate opens and closes on its own, and you can tell there is nothing alive in that cursed place...nothing at all.
When Orlok first appears in the courtyard to meet Hutter, he appears in a distance shot, and due to the low resolution of the film, it makes his face look even creepier, because all you can see of his facial features are three tiny pinpricks.
Orlok's disturbing behavior during the dinner scene. He just stares at poor Hutter, and when Hutter accidentally cuts himself, has to keep himself from drinking his blood. You can tell that Hutter is regretting the journey, and even if he doesn't know that Orlok is a vampire, he might be some sort of deranged madman.
An especially terrifying shot is when Ellen looks out her window across the street at Orlock's house. In a dark window off to the side there is a tiny white dot. Orlock is always watching her.
The scenes where crowds and crowds of rats follow Nosferatu wherever he goes, paying homage to the ancient idea that the plague is brought by demonic spirits.
From the 1979 remake
In Werner Herzog's 1979 remake the opening shots are rather creepy. We first see images of real preserved bodies filmed inside the catacombs of a Mexican graveyard. Then a slow motion shot of a flying bat in black-and-white is shown. This is followed by actress Isabelle Adjani awakening from a nightmare and screaming out in fright.
The scene in the remake where Harker meets Dracula. He prepares a meal for him and while Harker eats, Dracula never takes his eyes off him or even blinks. After a few minutes Harker cuts his finger and Dracula tries to suck the blood from it. When Harker pulls away they stare at each other for a moment before Dracula knocks Harker's chair aside and moves toward him. Harker backs away into a chair in front of the hearth and Dracula visibly struggles to restrain himself.
The ending is even more horrifying that the original. Harker, now a vampire, leaves the plagued village to spread death elsewhere and presumably create more vampires.
From the SNES video game
The game over screen can be this once you realize that the photograph slightly alters itself to reflect Erin's vampirification.