Horror films you've never seen?

Ruggero Deodato has said he now regrets everything he did, especially the animal deaths. He said once that he wishes he'd never made the movie.

Immediately after a pig was shot and killed, Carl Gabriel Yorke botched a long monologue that Ruggero Deodato wanted to include in the movie. After rehearsing the line several times and doing fine, Yorke says he screwed up during filming because he heard the pig squeal and die. Retakes weren't possible because only one pig was "allotted" to be killed.

Ruggero Deodato intended for the natives to eat fake brains from a fake monkey head. The natives talked him out of it because monkey brains were a delicacy to them.
The animal deaths in the movie were real. The list of dead animals includes a coatimundi, a yellow-spotted river turtle, a snake, a tarantula, a young pig, and 2 squirrel monkeys. The monkey-killing scene was shot twice, so two monkeys were killed for that scene. The dead animals were given to the tribes for food.