Those Darn Magicians
The magician will generally have a few things on hand for this trick. In a lot of cases, if the magician is working with a cup of water, to avoid spillage, the magician will be carrying a small piece of clear ice (ice with no air bubbles). When the ice is dropped into the cup, the water will freeze instantly. When using a bottle, the magician might just smack the bottle on the table, the impact causes the water to turn into ice.
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