At school, little Johnny’s classmate tells him that most adults are keeping at lease one dark secret, and it’s easy to blackmail them by saying, “I know the whole truth.”
So little Johnny goes home and tries it out on his mother. “I know the whole truth, he says. “ Johnny’s mother says, “ Okay, here’s $20, just don’t tell your father.”
Later that night, Johnny’s father comes home, and Johnny says, “Dad, I know the whole truth.” His father says, here’s $40, just don’t tell Mom.”
The next day, walking to school, he bumps into the mailman. Johnny says, I know the whole truth. “ The mailman drops his bag and says, “In that case, come give your Dad a big hug!”