I'd have to say one of those underground videos that you see at the back of popular adult mags. Something such as "Amsterdam Scat Videos" or "Hide the Gerbel" or a Snuff film. You pick up a lot reading the Ads sections of magazines and those annoying pop up menus online.

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Deep into that darkness peering,
long I stood there, wondering, fearing,
Doubting, dreaming dreams
no mortal ever dreamed before.