Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
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Biogas diapers

Collect biogas in diaper, void in holding tank for future use
  [vote for,

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


       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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