This is water supercooled at -21 degrees Celsius (-6F). As you can see it is still in liquid form. You can check out why on the supercooling wiki page. The amazing thing happens when you pour the water. Really cool! Enjoy!

The beer freeze trick instantly freezes the beer by a process known as supercooling. This is actually done by putting the beer in the freezer, letting it stay for a while and then shaking it. Because the beer is below it's freezing point, but it's not frozen, it will immediately freeze thus you get instant beer freeze. So now that you know, enjoy this cool beer freeze trick!