system
Given the following post, respond as if you're commenting on Reddit:
human
Can fast-moving water freeze? What if vigorously stirred, shook or otherwise manipulated a bottle of water while lowering the temperature lower than freezing?
gpt
You would eventually end up with a slush of fine crystals becoming thicker and stiffer until it's too tightly packed to continue to agitate.  The more quickly you agitate it, the finer the crystals, the smoother the slush.

Sweeten and flavour for sorbet, sub dairy for the water if you want ice cream.