I see a lot of people listing
Human Centipede, and I'm going to say something that's going to blow some minds.
Human Centipede was less disturbing then 99% of horror movies out there.
There's less blood, less gore, and less pretty much everything else that is included in most other horror movies. Hell, you don't even really see most of the surgery/torture. it's just implied. The movie, to be perfectly frank, is just
really badly made. The characters make no sense, the dialogue is
terrible, and the ending was bullshit.
Human Centipede 2, however, made
Human Centipede look like a goddamn kid's movie. The 'villain' is 1987928347 times creepier, more disgusting and also has the added benefit of having zero medical training. On top of that, the butchering of the people is shown. Also, at the end of the movie, one of the people, a pregnant woman, gives birth in a car and her newborn falls to the floor of the car. The infant slides to the front underneath the gas pedal somehow, still attached by the umbilical cord. Instead of just picking the infant up and putting it in her lap while trying to get away from the serial killer? The woman
slams her foot onto the gas and crushes the infant's skull.
That is
actually shown, which means some poor schmuck in the props department drew the short straw and had to create a fake newborn to then show crushed to death.