Half a croissant, on a plate, with a sign in front of it saying '50c'
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loo roll - air brake/ odour mitigation fan

 
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A small fan-blade assembly which clips to the end of a loo roll. When the loo roll is turned, the 'air-brake' effect moderates the turning motion of the loo roll, preventing it turning spontaneously due to the gravitational pull of any accidentally unravelled loo roll. The breeze generated by this fan also blows post-defecatory odours away.
hippo, Mar 24 2015

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       Shouldn't you use this to generate electricity as well?
normzone, Mar 24 2015
  

       There is scope here to apply custard as a fluid flywheel speed governor.
mitxela, Mar 24 2015
  
      
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