Supplies:

1 plastic pop or water bottle (16 oz) with lid
2 drops clear dish liquid
1 tsp glitter

Directions:

Fill bottle with cold water.  Add dish liquid and glitter to the bottle.  Screw the lid on the bottle tightly.  Holding the bottle by the neck, turn it upside down.  Quickly rotate your wrist several times in a clockwise motion.  When you stop rotating your wrist a mini tornado will form inside the bottle.