1. Take a can or a bottle of any kind of cola or soda.
2. Shake it as well as you can to creat a lot of pressure inside the bottle.
3. Place it in the freezer for about 3-4 hours ( it depends on the temperature )
4. Take the bottle out of the freezer carefully and slowly
5. Slowly spill it in a glass, as you spill it will start to form ice crystals