How to freeze beer instantly ? Can anyone explain this?!

I think what you are describing is something known as super cooling. A supercooled liquid will stay in a liquid state below the normal freezing point when it has little opportunity for nucleation; that is, if it is pure enough and has a smooth enough container. Once agitated it will rapidly become a solid.
So what you would see is a liquid beer in the bottle, then when you tap the side of the bottle the beer instantly turns solid, if that is what you are talking about?

-edit-
Basically, the ice needs something to form around such as dust, minerals etc. normally found in water. But if the water (or beer) is pure enough it will not freeze at 0°C, and instead will freeze when it reaches ?42°C. So you can put your beer in the freezer and cool it down to around ?20°C without it going solid, but as soon as you tap the side of the bottle etc. bubbles form which then gives the ice crystals somewhere to form (aka. nucleation) and so the beer freezes solid.

http://en.wikipedia.org/wiki/Nucleation for a more sciencey explination

http://www.associatedcontent.com/article…


I don't remember how long they kept it in the freezer, but it was like 3-4 hrs I think, they take out the beer, and it's not frozen and slam the top or bottom which aggravates the molecules causing 'super-cooling' I believe they called it. Look it up on Youtube.

You could do it with liquid nitrogen but not sure of any other way to do it

----edit----

Giving full credit to the guy below me, I looked this up and found this video. Pretty cool

http://www.youtube.com/watch?v=gGpNhBPYN…

put in freezer