We had a group of six people using 3D-printed skull whistles for an outdoor festival/theatre/ritual event, emulating the sound of shrieking storm winds. It was incredibly atmospheric, and the sound carries surprisingly far!<p>Depending on how you place your lips and shape your mouth, you can get semi-white-noise sounds from soft to harsh, or you can shape the noise into something more like a scream/shriek.<p>It's funny seeing them turn up on HN just a month after using them in person :)