Half a croissant, on a plate, with a sign in front of it saying '50c'
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Quis custodiet the custard?

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slightly pre-crushed cans

Soft drink cans that you have to restore to uncrushed condition
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The slightly pre-crushed soft drinks range are the intended to encourage dexterity and invention in those who tendency is to crumple up their drinks can when it is empty and toss it away.

The pre-crushed cans would come carefully engineered to be slightly pre-disorted, according to an algorithm that ensures that a few judicious twists and manipulations will pop them back into perfect form. There would be a limited range, graded for degrees of difficulty, with the folds and indentations labelled and mapped with numbers and dotted lines to facilitate publishing a solution.

xenzag, Feb 09 2006

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       So, like a Mellow Yellow Rubik's cube?   

       Just blow very hard into the opening.
DrCurry, Feb 09 2006
  

       dr curry - that might work to some extent if they were tubular cans... but are they ?
xenzag, Feb 09 2006
  

       But how will these precrushed cans handle the internal pressure required for carbonated soft drinks or beer?
Galbinus_Caeli, Feb 09 2006
  

       same way as they do now if you mangle them a little before opening... but since they are designed to take the internal pressure as part of their new slightly pre-crushed form, it would not be a problem.
xenzag, Feb 09 2006
  

       [zenzag] You must work out.   

       I know that I cannot make any change in the general topology of an unopened can of Coca Cola with my bare hands. I might be able to deform the opening tab, or maybe the lid rim if I had pliers, but not otherwise. The main body is quite rigid, I can slightly depress the sides, but it pops right out. I think this is due to the pressure contained within. It is like an aluminum balloon.
Galbinus_Caeli, Feb 09 2006
  
      
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