Here's a video clip from a 1965 black-and-white Polish film called "Salto" featuring a band playing a truly nerving-wracking instrumental piece. It starts off with a bass line as creepy as the theme from "Jaws" and, as the other instruments come in, it all becomes increasingly disturbing.
The dancers look groovy in their boss '60s suits and beehive hair-dos, but they move around like zombies performing some black magick ritual. Truly the reason why the letters "wtf" were invented.
Wojciech Kilar: Salto theme (video)
Wojciech Kilar: Salto theme (mp3) - You axed for it!