I love my drinks cold. Wicked cold. It doesn't matter if it is water, milk, or cider; it is perfect when frost is starting to form on the top. I'll even expedite this process by placing the beverage in the freezer for 5-10 minutes. Sometimes though I'll forget it is in there for a day or two, and when I return the drink is transformed.
While the bottom of the mixture still is liquid, the top is frozen solid! A few minutes out on the counter remedies this but just what is going on? What I stumbled upon is actually the first step in a process called Fractional Freezing.