Once there was a Sunday School teacher who taught a 8th grade class. One day, at the end of a class, he told the students, "Next Sunday I will teach about the sin of lying. To help you understand, I want you to read all of Mark 17." Then he dismissed the class. The next Sunday, he asked "Okay, before I start my lesson, I want to know who read Mark 17." Everyone raised their hand. He replied, "Mark only has 16 chapters. Now I shall continue with my lesson............."