You also require a blender. First add 1/4 a cup of Rum to the blender, next add a 1/4 cup of Pineapple juice, then add 1/4 a cup of ice. Blend and pour into a glass. Add 1/4 a cup of rum to the (empty) blender, next a 1/4 a cup of Cola to the blender, then add 1/4 a cup of ice to the blender. Blend and pour into the same cup that contains the Pineapple mix. stir lightly and drink.