Dinner Questions

Question:
Why does shaking a closed carbonized beverage make it explode when you open the can?

Hints:

• The pressure inside the can remains basically the same (unless you heat it, say). So shaking the can doesn't increase the pressure.
  
• Freezing, or nearly freezing the beverage often has the same effect.
• When nearly freezing you'll get tiny crystals in the beverage.

Answer:
Creating bubbles from nothing takes a lot of energy. Making a bubble larger, takes less energy. What you do when you shake the can is tiny bubbles, which can grow easily when you open it.
I believe the same thing happens when you freeze or nearly freeze the beverage. It's easier to grow the bubbles when there's some small particle to start it off from.