Goat sex scene
The sequence in "The Antichrist" where the lovely Carla Gravina gleefully copulates with a goat rates highly as one of the sickest, most shocking and disgusting things I have ever seen in an Italian horror flick. I've watched more than my fair share of hardcore vile and revolting in-your-face grody'n'graphic fright flicks, but this particular stomach-turning sequence has to be one of the most depraved and thus disturbing moments I have ever witnessed in a sleazy 70's horror feature.
"Warren Oates died for our sins"