Ever wondered how all those scary movies sound so scary? Well, you can get a glimpse into all those horror-movie sounds in this old video that's bubbling up across the web. In it, a man plays an instrument called a waterphone, which makes the smooth, eerie sound that's regularly featured in movie soundtracks. Watch the fascinating video to see how it works, then check out upcoming horror movies to get excited about and find out more about how movie sound effects are made.