At school a classmate told Little Tommy 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."

Little Tommy 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 $20 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 truth."

His father promptly hands him $40 and says, "Please don't say a word to

your mother."

Very pleased, the boy is on his way to school the next day when he sees the

mailman at his front door. The boy greets him by saying, "I know the whole

truth."

The mailman immediately drops the mail, opens his arms, and says, "Then

come give your real father a big hug."