Animal mistreatment of any kind, real or fake, unless it's genuinely important to the plot.

That scrotum puncture thing from Serpent and the Rainbow always seemed pretty awful.

The end of Famke Janssen flick 100 Feet, ChronoGrl defo wouldnt like it as some poor bugger gets beaten TO FUCK by a vengeful spirit. Bones and teeth all over the place, very unpleasant.