A couple of scenes that make me wince are the chopstick rape in "Bunman"(The untold story) and also the killing of the children scene .
Another one I find hard to watch isn't from a horror film it is a scene involving Gene Hackman in Nic Roegs "Eurika" involving a blow torch. A very similar scene to that one from Fulci's "Contraband" involving the same said instrument, but seems more gruesome and effective in "Eurika".