Coworker was talking about how he's been desensitized because of anime. Trying to sound cool because of it. He's like "yeah I've watched corpse party and higurashi, I'm totally desensitized now."
I told him there are still anime/manga out there that he'd be very uncomfortable watching/reading. Wasn't about to tell him though lol. I'm not gonna be the one to introduce him to anything beyond incredible gore.
Actually, I should recommend some Junji Ito. Won't shock him, but Ito doesn't usually just rely on gore itself but more body-horror stuff.
He'll be interested via the title.
Give him anaesthetic if he really wants to be desensitized.