This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / A Nightmare on Elm Street (1984)
What a terrible way to die.
The most famous two deaths are Tina's death in which she's brutally dragged across the ceiling of her bedroom and when Glen is pulled into his bed and turned into a geyser of blood.
"I'm your boyfriend now, Nancy."
Any scene involving the dream version of Tina's body, highlight being that giant centipede coming out of her mouth.
Rod's blankets slowly wrapping around his neck, before eventually dragging him up so that he can be hanged in his prison cell.
As tacky as the scene was, at the end when the car hosting the colors of Freddy's sweater whisks the shocked kids in it away while the happy mother waves goodbye, before she is sniped through the window while children are singing the eerie song... That scene just...why.
The special effects failure amplify the, er, nightmarish surreality of the final sequence.
There is something inherently... unnerving about the intro scene where you see Freddy building his glove amidst audible breathing and the film's signature soundtrack.
The rape symbolism where we see Nancy take a bath and Freddy's gloved hand comes out of the water towards her from in-between her legs.
There's something distinctly unnerving about the way Freddy's voice shifts from a soft, quiet tone to a deep, guttural and demonic voice.
While it is likely Narm to some, the scene when Nancy finds Freddy (on fire) attacking her passed-out drunk mother in bed. She and her father throw a blanket over him, he disappears as they pull it back... and we're left with a shot of Marge's burned skeleton that somehow lifts an arm toward them (pleading for help? saying goodbye?) while sinking away into a grave-like hole in the mattress filled with ghostly fog and flickering lightning. This eventually seals over, and Nancy leaps at the empty mattress, desperately clawing to get her mother back...
The school scene. All of it. Nancy falls asleep in class, then sees Tina in a body bag being dragged by an invisible force and leaving behind a trail of blood, which leads her to Freddy's boiler room, where he chases her and she burns her arm on a pipe and wakes up screaming.