Half a croissant, on a plate, with a sign in front of it saying '50c'
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Biogas diapers

Collect biogas in diaper, void in holding tank for future use
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Diaper collects biogas. Have collection stations in convenient locations (Conveniently at public toilets if you feel public spirited or just at home. Diaper will hook up to holding tank where gas is stored for use whenever required.
AHJ, Apr 12 2009

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       Someone already got this one - Fart collection underpants. Sorry, should have checked. Not only half baked but also short fused.
AHJ, Apr 12 2009
  
      
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