title_body: Why is not sake freezing in the freezer but on the air after serving?
upvoted_answer: The sake was most likely supercooled.  It was cooled below its freezing point, but there were no impurities to form ice crystals.  When it was poured into a glass, as the author of that video suggests in his comment, it created turbulence that produced ice crystals to form, and once that process starts, accelerates until it is completely frozen.  It is a fun experiment to do yourself with just water.