Johnny was walking home on a cool day when the wind caught his hat and carried it out onto the lake. There was a thin layer of ice that covered the water. The hat sat in top of the ice layer, looking like the day that Johnny had bought it. Johnny tested the ice with his shoe. It seemed secure, but he could see the water at the edges of the ice. He carefully tiptoed across the sheet of ice to his hat and picked it up. As he did so the ice cracked. A large sheet began drifting away, Johnny was surrounded by cracks. He took another careful step, putting his weight directly on one of the cracks and then...​