Supercooled water (water cooled below its freezing point, yet still liquid) is made. The bottom of the bottle is hit against a table and ice crystals instantly form. This is because the shock of impact makes enough water molecules align and act as nucleation points.

What is the science behind supercooled water?

Description: Supercooling occurs when the temperature of a liquid is lowered below the freezing point without forming a solid. ... If the water has been filtered through reverse osmosis or chemical demineralization it can be safely cooled below the freezing point. Simply shaking the bottle forms solid ice.

Is supercooled water safe to drink?

Warning: Don't drink the supercooled liquid!

“It might break your teeth off because it'll freeze in between two teeth and push them apart,” says Hill. Once it's frozen, however, it will become safe—so feel free to down that beer slushie.