Two of the managers from different departments meet up at a lunch, After dinner, Austin says to Jack "Well Jack, I don't know what you think of your employees, but mine are all bright and brilliant."
"How do you know?" asks Jack "Oh well, it's simple", says Austin. "They all have to take special tests. Wait a second".
Austin calls Peter over and asks him "Tell me, who is the child of your father and of your mother who is not your brother and is not your sister?" "Ah, that's simple", says Peter, "it is me!" "Well done Peter", says Mark, Jack is very impressed and wonders about the intelligence of the employees.
He calls in his favourite employee and asks "Tell me, who is the child of your father and of your mother who is not your brother and is not your sister? " The employee thinks and thinks and doesn't know the answer. "Can I think about it a bit further Sir? May I let you know tomorrow? ". "Of course", says Jack, "You've got 24 hours."
The poor employee goes away, thinks as hard as he can, and calls everyone he knows but no luck. Eventually he says to himself "I'll ask Bill, he's clever, he'll know the answer." He calls Bill and says, "Tell me, who’s the child of your father and of your mother who is not your brother and is not your sister?" "Very simple", says Bill, "It's me!"
"Wonderful!" says the employee and hangs up. Jumping with joy realizing that he knows the answer, he rings Jack. "Sir, I've got the answer!".
"What is it?"
"No, you idiot", says Jack, "It's Peter".