I saw a photo of a chemical burn victim on r/eyeblech. The story goes that this guy cheated on his wife, and his wife found out. So she poured acid on his crotch. The acid had burned his scrotum away, but the balls themselves were still relatively intact. Each was just hanging from it's respective tendril and resting against the burns on his legs.
That was the worst I've seen on a gore level. But I've seen some things that are worse on an emotional level.
Back when I was badly suicidal few years back, I went looking for suicide videos to get a more grounded understanding of what it's like. I found a site with a lot of them. Won't be giving out the name, cause you shouldn't look for shit like this.
I remember seeing one of an Indian guy jumping from a high roof. He didn't really move much in midair, he looked stiff and only squirmed a bit. When he landed it was just a relatively quiet thud and a crunch. He bounced once off the dirt. That one stuck with me the most.
Another that really got me was of an Asian who'd jumped onto train tracks. The train had cut his legs off, but he was still alive. In too much shock to do anything but lie there and look around at the people around him.
Then there's the guy who got his head chopped off with a machete.
Remnants of a suicide bomber splattered across a street.
Then those videos on YouTube, mostly just audio. The brick and windshield. The girl calling the police because her brother shot himself. The audio ones comfort me in a way, but at first they really unsettled me.
Come to think of it, I've seen far to many of these... I definitely saw them at way too young an age