The Return of the Texas Chainsaw Massacre (1994) ending / spoiler
It turns out that the family aren't cannibals - they just attack and kill people because a government agent of some sort wants people to have a true experience of spiritual horror. Jenny escapes from the house, and flees down a highway, pursued by Vilmer and Leatherface. Just when it looks as if she's going to be caught, a plane flies down, kills Vilmer with its propeller and promptly disappears. Jenny flees while Leatherface cries and spins his chainsaw around, and eventually makes it to a hospital. As she gives an interview to a cop, another patient is pushed by on gurney - and it turns out to be Sally, the survivor of the original massacre.
Submitted by Dave