Under the Skin
Under the Skin doesn't need gore to be disturbing. An extraterrestrial disguised as a human woman drives around Glasgow, luring unsuspecting men into her van, after which they are sent into a liquid abyss and preyed upon for food.
The Texas Chainsaw Massacre
In The Texas Chainsaw Massacre, a group of hitchhikers falls prey to a family of cannibals. Despite its name and gory legacy, The Texas Chainsaw Massacre actually features very little actual gore—a purposeful move by director Tobe Hooper in order to acquire a PG rating from the MPAA. However, Hooper's plan failed, and the film received an X rating, later reduced to R.