Half a croissant, on a plate, with a sign in front of it saying '50c'
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Raincoat Sound Antenna

With foam disk attachment that doubles as an umbrella/ hearing aid
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The hood to this raincoat is a semi-rigid half-sphere of foam that can be worn like a rain helmet/ head-umbrella or flipped back to a vertical position to act as a sound-focusing hearing antenna.
JesusHChrist, Dec 10 2013

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       //half-sphere of foam// Would work better if the shape is parabolic and the surface is dense. +
csea, Dec 10 2013
  

       and the award for "Suspect Surveillance Techniques" goes to ...
FlyingToaster, Dec 10 2013
  
      
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