Advertisers are looking for ways to get their messages into your head--and they're succeeding. In fact, A&E is promoting a ghost-themed series called Paranormal State with the help of a technologically advanced billboard. According to this article in Advertising Age, it uses technology that transmits an "audio spotlight" from a rooftop speaker so the sound is contained within your cranium. So far, this technology hadn't been used on such a grand scale as this New York City billboard. Typically it's ideal for museums and libraries that promote a quiet environment. Joe Pompei, president and founder of Holosonics, the company that created the technology for the billboards, says it was designed to avoid adding noise pollution. "If you set up a loudspeaker on the top of a building, everybody's going to hear that noise. But if you're only directing that sound to a specific viewer, you're never going to hear a neighbor complaint from street vendors or pedestrians," he said.

But not everyone is welcoming this rather intrusive technology with open arms. The website Gawker criticized the billboard last week by saying, "How soon will it be until in addition to the do-not-call list, we'll have a 'do-not-beam-commercial-messages-into-my-head-list'?"