Hot ice, scientifically known as sodium acetate, is a liquid that will turn solid at the slightest provocation. Touching it with your finger or bumping it too hard will cause it to spring from a clear, water-like state into solid ice-like crystals.
Elephant Toothpaste - cup hydrogen peroxide liquid is a solution, which can be found at a beauty supply store or hair salon), 1 Tbs (one packet) of dry yeast, 3 Tbs of warm water, liquid dish washing soap and food coloring
In a small Ziplock bag: cup half and half (milk works too), 1 Tbsp sugar, 1 tsp vanilla. Insert that bag into a gallon Ziplock filled with ice and salt. Shake the bag for five minutes. Then remove the smaller bag which should have turned into ice cream!