I Spit On Your Grave (1973)
This still-notorious film now seems tame in the gore and nudity departments, but its violence against women is still outrageous.
A writer in a rural town is raped and beaten by a gang of men, and then one by one stalks and kills them.
Shot in a blank, unemotional style which paradoxically makes it very intense. Not for children - or feminists of any age.