It's possible some Faces Of Death/Guinea Pig series fans might get a kick out of Srdan Spasojevic's A Serbian Film, but it defines niche appeal, the appeal here apparently being to see how much grooey nastiness you can stomach.
Apparently porn star Milos's adventures are all an allegory for the Serbian political condition, but you shouldn't pay too much attention to this thin claim: the plot is mostly an excuse to string together scenes of unreal sexual violence - you may have heard about the bit where a newborn baby is raped. Oddly, it's harder to hear about than actually watch, since the film verges on cartoonish in its gross-out presentation of the worst atrocities the filmmakers could dream up, while the dim, bleached-out filming style creates a certain distancing effect.
It seems only fair to the potential viewer to be completely blunt about what the viewing experience entails here. The catalogue of charming acts you'll have to sit through include (spoiler alert): a woman having her head hacked off as she's raped, sex in front of children, the aforementioned "newborn porn", murder-by-penis and father-son rape. So, you know, if you want to see that stuff, watch this film. If you don't, don't.