Well they do exist - although they're used on a much smaller scale, and for responsible scientific purposes.
Not for cooling beer. Ahem. No.
The principle behind a freeze ray is fairly simple (the execution is horribly complicated):
Heat - thermal energy - is due to the atoms vibrating. A laser beam, which is made of light waves, can make an atom vibrate at a different frequency. So it can be used to cancel out the atoms vibration - and eliminate its heat.
The scientific name for it is 'laser cooling'. Let's let this guy, who actually uses them, explain in a bit more depth:
It's still well beyond us to use this technique on anything very big, but the temperatures we can reach are close to absolute zero - so don't quit hoping for a way to turn the neighbours yappy little dog into an icicle yet...
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