
This was covered in Wired Magazine at least a year ago - but now it appears as though it's a reality, available for sale today. American Technology has created a device that allows you to project a beam of sound, like a laser beam, as much as 150 yards. The recipient hears your signal loud and clear, yet his friend standing two feet away can't hear a thing.
Japanese soda machine vendors are already using the technology - to target passers by. As they walk by the machine, they hear a soda being poured into a glass.
Think your marketing budget can't afford it? Think again. The device only goes for $600. Kevin's buying one for our office - so that he can send secret messages across the studio, to David. David will think he's hearing voices. Who knows what will happen next. From BoingBoing. Also covered in Popular Science.