Demon saying requiescat in pace human (latin for rest in peace)in reverse to get that otherworldly effect. I did this with my voice, reversed it and pitched it down 2 semitones.
This is me ripping a piece of paper, which resulted in a sharp, crisp sound of tearing. I think it could also very effectively be used to simulate the sound of a roll of packing tape being applied to a package.
I make a lot of my own samples for my music. They are often for use in granular synthesis or manipulated so that they become unrecognizable. I like to make them available for everyone. Enjoy!.