Drink the soda in the can until only ¼ to 1/3 of the liquid remains. If you can't gauge the amount of soda in a can, pour 8 or 9 ounces of soda in a measuring cup and leave the remaining liquid in the can.
Place the can on a flat, smooth surface, such as a cafeteria table.
Tilt the can at a 45-degree angle so the metal edge between the base and side of the can touches the table.
Release the can after the soda inside stops swishing. The can should stay tilted on its own.