Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
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 warning on Adult Swim. In YTV, this was initially skipped over when the show was broadcasted in Canada due to the brutal content. The second airing gave a warning to viewers on what to expect.
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.
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.