【明報專訊】"Have you ever had a sudden momentary impulse（一時衝動）to do something different, unusual, or even silly?" Martin asked. "Many times," Erda replied. "Desires like that are called passing whims," Martin said. "Whim rhymes with swim," he added. But Erda had disappeared（消失）. "I guess she had a passing whim to be alone," Martin mused.