[nealabq]

Instead, why not put CO2 dry-ice cubes in your drink? Or a spritz of liquid nitrogen? Or drop in a shot glass of liquid helium? Or super-cooled metal balls?

[jerf]

One of the other problems is that if you cool too quickly, you get an ice layer around the cooling, which then inhibits you from cooling any further. (Note I say "inhibits", not "prevents".)

[mikeash]

Dry ice will, ironically, make your soda go completely flat as it constantly agitates the drink as it boils/sublimes away.

[Groxx]

but it'll make water pretty carbonated (though not to soda's level). or at least have the same bitter, bubbly flavor (never really looked up if that's actually what happens)

[nealabq]

Cubes of frozen alcohol might work. Maybe with a little frozen C02 mixed in for certain drinks.

[mikeash]

I love it! Now I just have to figure out how to generate a temperature cold enough to do it.