Half a croissant, on a plate, with a sign in front of it saying '50c'
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Stealth Sky Lantern

Exactly what it says on the (black) box
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A "sky lantern" is a small hot-air balloon made of (usually) white paper, with a small burner to provide heat.

The BorgCo "stealth" sky lantern is made of matt black paper or plastic, and the heat source is a low-signature fuel such as hexamine, metaldehyde or "sterno". As a result, when released into the night sky, the device is almost invisible, rising rapidly out of sight.

Purchasers may also be interested in two optional extras offered by BorgCo; either a set of black metalized streamers, designed to give the device a radar echo totally out of proportion to its size - guaranteed to disrupt air traffic control over a wide area; or a neat, lightweight, time-delay thunderflash, which produces an extremely loud detonation in mid-air at a preset time after launch - guaranteed to wake everyone within a five kilometer radius at 0300, yet leaving no evidence of its source.

8th of 7, Sep 12 2011

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       Quite a litter problem when they land I understand.
pocmloc, Sep 12 2011
  

       Not if no-one can see them ...
8th of 7, Sep 12 2011
  

       Are you going to publish the plans and disperse them via flash mob?
normzone, Sep 12 2011
  

       ...or a flash-less mob even?   

       //Make the entire thing combustible and include a cheap altimeter. If it falls below a preselected altitude, the whole thing goes up in smoke, and the altimeter melts into an unrecognizable lump of plastic and metal. This ensures there is little litter and no evidence.// Baked. Aeroflot.
MaxwellBuchanan, Sep 12 2011
  
      
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