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CLUMP The pteranodon spreads his giant wings, and... Mom is sewing in her chair as Calvin walks by. Calvin walks by later with a conical hat and a cape. Mom keeps sewing. She hears a CLUMP and walks to the window to see what it was. She sees a ladder sitting against the wall. She races out of the house, looking up at the roof. The pteranodon spreads his wings and prepares to soar.