This is a great activity for young students to do to illustrate the Parable of the foolish man building his house on the sand. Matthew 7:24-27 The Message.
Punch 2-3 holes in the bottom of a plastic cup. Fill the cup with water. Hold the cup above the house built on the sand. The water will drip out of the holes in the bottom of the cup to represent rain.
Jesus is the solid rock foundation upon which to build our lives.