Cannibals? Zambianmeat.com has finally been taken down, I think, but you could infiltrate the layers to find actual cannibalism and dudes looking for a coven of femcanns to eat their arm or leg in a ritual.
The people who peel faces off of their sacrifices before they kill them? There are videos of the cartel doing it, but this year definitely saw a number of news stories of victims having their faces peeled off while still alive.
Sexual torture of infants? There are plenty of videos on the Internet, but also you can find police evidence lists (Norewegian Political Pedophiles case has this in their evidence list) where we can know for certain that this is happening. Also, a DNC chair in Little Rock was convicted of doing this on streaming video for people.
The cult of the shit eaters? A number of serial killers are also into scat play. It seems that making children eat feces at a young age makes it so that it doesn't smell bad to them when they get older... even often liking the stench.
I could go on... it's tough to decide the "single most fucked up" thing, but I would guess that a video of the face peelers probably is the worst thing most people see. It gives people nightmares, literally.
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