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 [1] to get excited about and find out more about how movie sound effects are made [2].