Just watched bits of "A Serbian Film"
Learnt about this film doing my AS film studies, its named as one of the best/worst horror films ever made.
A few points:
1. How on earn is it on youtube, it is literally a collection of the most fucked up pornography available on the dark web.
2. If you want to take away the shock value of any other horror film you ever watch, go ahead and watch it.
3. It's actually pretty well made.
4. Don't watch it