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

 Get more head
  (+4)
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The base of the liquid-holding portion of this stein has a small hole through which gas and liquid can flow each way. Under the hole is a container containing a piece of dry ice. It also has a device capable of grinding off a small amount of dry ice. Every time the cup is tipped a tiny amount of dry ice is ground, the hole is freed of water ice, and the CO2 is permitted into the stein where it will assure a consistent amount of head on one's beer. (or keep your soda perky)
—Voice, Mar 13 2022

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       (+) for the concept but... if the CO2 is not pressurized will it not just instantly bubble up upon release and sublimate a fog spilling over the lip of the stein?   

       A fog spilling over the lip of the stein is surely much better than plain old froth. That would be a proper mad scientist drink.
—pertinax, Mar 13 2022
   


 

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