Most people can tell the different between music and other kinds of noise, but some genres may be tougher to distinguish than most. In an extreme case of this, a concerned man in Amsterdam thought his neighbor, who was singing along to some opera on his headphones, was a man screaming in agony. From afar, listening to the singing man without the context of the music must have been a terrifying and intense experience -- intense enough, in fact, to call the Amsterdam police. And while music is probably best enjoyed with some level of intensity, the incident finely illustrates how things can quickly go from invigorating to threatening.
