When you shake a carbonated drink, the gas tries to get out. If the gas cannot find a way out of the liquid, it will dissolve back into the drink over time.
When drink cans or bottles are closed, there is enough pressure in the can/bottle to prevent the gas from escaping into the air. So if you just wait a while, it will be safe to open again.
When you open a can while the gas is excited, the pressure in the can evens out with the pressure of the air, and now all the gas is able to escape (bringing some liquid with it) causing the fizz that explodes out of the can.
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