The foaminess isn’t permanent. When you shake it the carbonation comes out of the liquid and makes foam and pressure. If it then sits still, the gas dissolves back into the liquid and it’s fine.
When you open a beer from your pocket, it only foams because you’re opening it before the gas has a chance to dissolve back into the liquid. If you opened a beer right off of one of those trucks, it would explode foam too. But then the beer from the truck gets to the store and after even a few hours sitting still, the gas all goes back in. If you transport a beer in your pocket and then let it sit for a few hours, that won’t explode either, even though it was shaken in the past.
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