This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / Ghost in the Shell: Stand Alone Complex
The episode "Jungle Cruise". A killer who skins his victims alive and leaves them in great pain to die a while after it? Check. Showing the victims in all the gory detail? Check. Showing a video of the killer beginning to skin his victims alive, including a scream which consisted of pure blood-chilling agony? Check. This particular episode was gruesome enough to get a Content Warning on Adult Swim (and some light editing, mostly muting out "shit" and "dickhead"note which [adult swim] these days can get away with, as seen in some of their comedy shows and digitally darkening the scene of the first murder so the viewer can't see the female victim's breasts). On Canada's YTV, the episode was initially banned due to brutal content, though the episode did eventually air with a content warning stating that the episode's violence is beyond what YTV usually allows.
The scene which best exemplifies the episode is when Togusa is watching the video of the woman about to be skinned alive, and just as we hear the bloodcurdling scream, he runs outside nearly throwing up. Nothing Is Scarier indeed.
He also plugs into his victim's brain to make them see through his eyes. He makes them watch themselves being skinned alive.
Somewhere it had been admitted that this episode was a homage to the film Strange Days, and rightfully so, only what happens here is a touch more horrific.
The first time the Individual Eleven assemble they cut each other's heads off live on TV, save Kuze.
There's also the time the Major fires an anti-tank gun into an armoured suit from point-blank while the guy inside is screaming in terror, though that's unintentionally creepy.
Kazundo Gohda. Period. Also, the last episode of 2nd Gi G when Section 9 attempts to capture Gohda, only for Major Kusangi to BRUTALLY kill him (you see his head explode, leaving only his lower jaw and tongue).
The Puppeteer seizing control of Togusa's body in Solid State Society and forcing him to deliver his own daughter to it. The fact that he came this close to shooting himself to save her makes it even worse.
The second series uses exploding heads symbolically, once in the first episode and once in the last. There is no panning away.
The manga manages to give Batou a genuinely scary "Rape Face◊" in it's portrayal of episode 7: "IDOLATOR"