Sorry for the Autoplay (hit pause if you're scared). Put the children in another room. Listen and be AMAZED and SCARED!!!!
The anthropology website that uncovered this audio.
EDIT: I couldn't fix the autoplay (was getting kind of annoying having to scroll down and turn it off every time I refreshed the page) so I deleted the file, but the link is still there for anybody who wants to hear it. -- LCJ