What's the most disgusting thing you've seen on the internet?

[Opa-Opa]

Here are a few:

Goatce.cx

Lemon Party

and some video about 10 minutes in length that showed pee-hole torture
(penis's being splayed, scrotum's cut into, penis's smashed between plexiglass, etc.)

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There's a whole list of "shock sites" somewhere.