How to make an instant slushie...

[kleenex]

Self Freezing Coca-Cola (The trick that works on any soda!) - YouTube

 

[Steve Kroll]

Ok, that is actually kind of neat trick... although I would be a little worried about kids trying it and having a bottle or can explode in their hands.

 

[LPBeier]

I don't know if I would try it, but it is interesting.

 

[Mad Cook]

3 hrs 15 mins is scarcely "instant"