Half a croissant, on a plate, with a sign in front of it saying '50c'
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Faecal recogntion cat door

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A cat door with a chemosensor linked to the catch.

The door allows cats to exit the premises, but if it detects even the most minuscule trace of cat excrement odour, it locks, preventing cats from entering.

8th of 7, Jun 18 2017

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       That's lame. A baseball bat should strike, launching the smelly cat into outer space.
neelandan, Jun 18 2017
  

       I didn't realize that [8th] has his own category here!
xandram, Jun 21 2017
  

       Ha - comment of the year :-)
xenzag, Jun 21 2017
  

       // I didn't realize that [8th] has his own category here! //   

       We are more powerful than you can possibly imagine ...   

       It's not quite the exact category name we want, but it's a good start.
8th of 7, Jun 21 2017
  
      
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