Superb use of holophonics and binaural recording techniques helped achieve the realistic effect. Make sure you use headphones. Turn your volume up a bit, close your eyes, relax, and enjoy.

This is not a prank and not a screamer. Nothing but pure aural fun.

If you want to save a copy you can get the MP3 off my Imeem page:

Update: I found more stuff like this here: http://www.moillusions.com/2006/05/audio-illusions-category.html