Half a croissant, on a plate, with a sign in front of it saying '50c'
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Photovoltaic suntan lotion

 you need to know what photovoltaics are
  (+3)
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You're the ground. Apply and allow to dry before attaching positive electrode pad. Now enjoy the sunlight while the lotion generates current. A good ground connection would be piercing, connected to the 5v regulator. The output would be more than enough to charge a phone or similar.
—evilpenguin, Jun 13 2012

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       So, the evil baddies can stake out their victims in the sun and recharge their portable devices at the same time...   

       Probably not a big UK market...
—not_morrison_rm, Jun 13 2012
   

       I cna just see some idiot get a sun burn trying to charge his cellphone. I like it. [+]
—dev45, Jun 14 2012
   


 

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