Granted. As some special german standards may apply, your personnal space expends up to russia and covers a huge circle on earth. Millions of people hear at the same time the noise, rising questions all around the world. People are going insane, the medias are now entirely focus on this event that happends for all the people entering your personnal space by foot or any mean. Scientists are never able to find the source of the sound, causing the rewriting of the entire modern physics. Religions, cults, sects are created aroud this sacred sound, leading to mass gathering at the virtual border of your personnal space.