Flat Pack Speakers
While attempting to develop a system to dampen the sound inside helicopters (or so they say, probably trying to emulate Blue Thunder's 'whisper mode'), the Ministry of Defence have inadvertently created a flat material that turns any surface into stereo speakers - dubbed SurfaceSound. This must have been a while ago, as it's been de-classified and products were on show at the recent CES expo in Las Vegas.
10th Jan 2008 - Tumblr