I literally 
when I saw the scene in the STV movie "Shelter" starring Julianne Moore and Johnathan Rhys Meyers. It's a typical supernatural horror flick. They have a video surveillance tape where a "shadow" moves across the screen. An audio/video engineer is trying to figure out what it is, but has no clue. He then looks over to a poster of Unknown Pleasures on his wall and has a ureka moment. The shadow is actually a visual representation of a sound wave. He isolates the shadow and generates an audio clip from the soundwave, which turns out to be a demon's voice. LOL!
