At school, a boy was told by a classmate that most adults are hiding at least one dark secret, and that this makes it very easy to blackmail them by saying, “I know the whole truth”. The boy decides to go home and try it out. He goes home, and as he is greeted by his mother he says, “I know the whole truth.” His mother quickly hands him a $50 note and says, “Just don't tell your father. ”Quite pleased, the boy waits for his father to get home from work, and greets him with, “I know the whole...