at the end of human centipede 2, a pregnant woman escapes from the 12 person ass to mouth "human centipede", which moments before was being literally fucked by the fat little madman who assembled the human centipede by crudely stapling them all together, and as she is getting into the car to escape him she gives birth to her child whom ends up under the gas pedal, and in a rush of fear or fight or flight or whatever she says fuck it and stomps on said gas pedal, crushing her newborn babies skull and killing it instantly. and they show everything pretty explicitly.
uuhhhhh yeah, id say thats about the most fucked up movie i can think of.