One day a classmate told little Timmy that most adults have at least one dark secret and that they can be easily blackmailed simply by saying, "I know the whole truth."
Timmy decided to try it out. He went home and when his mother greeted him, he frowned and said, "I know the whole truth." His mother quickly handed him $20 and said, "Just
don't tell your father!"
This worked so well for Timmy that he decided to see what he could get from his father. When his father got home, Timmy greeted him at the door and said, "I know the whole truth." His father promptly handed him $50 and said, "Please don't tell your mother!"
Very pleased, Timmy headed out the door to school the next day when he ran into the mailman. He greeted the mailman with his new phrase, "I know the whole truth."
The mailman dropped his mail, opened his arms, and said, "Then come give your daddy a big hug!"