If we're literally looking for "biggest splatterfest", then my vote would go to Braindead / Dead Alive: so ridiculously over the top as to be hilarious.
For notorious, graphic or grisly death scenes, either the fire extinguisher in Irriversible or the "cheese cutter" device in Cube: the first casualty.
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"Today people want sensationalism; the more you rape their senses the happier they are."
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