This seems familiar... (Score 1)

I could of sworn I read about this in a Popular Mechanics/Science. I remember an article about a guy that made this exact thing. It was a laser device that you could point at someones head and transmit sound directly to them, resonating off their skull perhaps and only they hear it. People were talking of crazy applications for it like personalized advertising as you walked around a shopping mall or something. Rather invasive I'd say.