One day, John came home with an unusual purchase—a robot that he claimed was a lie detector. It was around 5:30PM when Tommy, their 11-year-old son, went home from school, over two hours late. “Where have you been?” asked John. “The library,” said Tommy. The robot then walked around the table and slapped Tommy. “Son,” said John, “this robot is a lie detector. Now tell us where you really were after school.” “We went to Bobby’s house and watched The Ten Commandments,” answered Tommy. The robot again went to Tommy and knocked him off his chair. With his lip quivering, Tommy got up, sat down and said, “I’m sorry I lied.