The Manitou (1978)
If you can get past the seventies clothing and the seventies hairstyles, you can enjoy the campy humor added to this "horror" movie. While the special effects are horrible compared to the CGI effects of today's movies, it's still a lot of fun to watch.
In this story, a 400-year old medicine man (a demon by any other name) reincarnates himself into the present day via the hump in a woman's back. A couple of people recite what sounds like "vana, witchie, solitoo" a couple of times, just for effect. It's hilarious. It was hilarious when I saw it in the theater and it's still hilarious on DVD.
Starring Tony Curtis, Michael Ansara, Susan Strasberg and others. Here's a trailer:
