This DIY Theremin project uses infrared sensors and visible light to create what amounts to clever little audio projector. The closer your hand is to the light source the higher the tone and with a little practice you, too, can create the jarring, objectionable sound of the theremin in your own home or jail cell.
The full specs and ingredients are below, so get cracking. It requires some breadboarding and an understanding of microcontrollers, but you can probably handle it.