This is a link to print out warning Cards. bring the card back in five minutes and tell what you did wrong and how you will fix it. This gives students time to reflect on their behavior and cool down before discussing it with the teacher.
Salt Volcano: Pour several inches of water into a jar. Add about of vegetable oil. Drop in food coloring and observe what happens. Shake salt on top of the oil/water/food coloring mixture. Pour or sprinkle more salt, as desired.