Friend of mine recently introduced me to the Cthulhu mythos, and he's been pestering me for awhile to buy Alhazred, Author of the Necronomicon. It's not written by Lovecraft, but it's set in his Cthulhu mythos.
God...damn...
As far as sheer gross, it's hard to beat. On page 20 the main character is forced to eat the miscarriage of his lover, the king's daughter. It was a 4 month fetus, and it is grilled and then shoved down his throat. Then the same is done with the man's nose, ears, dick, and balls.
The creepy part is, it's all written from a first person perspective, but the wording is all...clinical. This is partly due to the fact that