1. Aftermath (1994) 

REASON: The entire movie is just half an hour long, and it's not even a movie, just a morgue scene where live autopsies are shown, and then one of the pathologists performs a necrophiliac act.

 2. Cannibal Holocaust (1980) 

REASON: There are some real animals killing onscreen. And killing the animals just for the authenticity and originality of the film is a complete no-no for me.