Preaching to the Choir
A friend was assigned a new post teaching English to inmates in prison. Feeling a little nervous on his first day, he began by asking the class a basic question: "Now, who can tell me what a sentence is?"
My father began teaching business classes at the local prison through a community college. On his first night of class, he started a chapter on banking. During the course of his lecture, the subject of ATMs came up, and he mentioned that, on average, most machines contain only about $1,500 at a given time.
Just then a man in the back raised his hand. "I'm not trying to be disrespectful," he told my father, "but the machine I robbed had about $5,000 in it."