The difference

A boy struggeling with his homework asks his father: "Daddy? What's the difference between potentiality and reality?"

The father thinks for a minute, then tells the boy to ask his mother, sister and brother one question each:

Ask your mother if she would sleep with Robert Redford for a million dollars. Then ask your sister if she would sleep with Brad Pitt for a million dollars. And last, ask your brother if he would slepp with Brad Pitt for a million bucks.

The boy asks his mother: "Mom, would you sleep with Robert Redfors if you got a million dollars?"
The answer was abvious: "Of course! Robert Redford? Any day!"

And the sister: "Hey sis! Would you go to bed with Brad Pitt for a million dollars?"
The sister: "Are you stupid?? Of course I would!"

And last, the big brother: "Would you have sex with Brad Pitt for a million dollars?" The brother is not quite as eager and says: "Well... Brad Pitt? I don't know. But a million dollars you said? Ok! I'd do it!"

The boy returns to his father and explains how the rest of the family replied, but he still can't see the difference between potentiality and reality.

The father says: "Well, my son. I will explain it to you. You see, in potentiality we are sitting on three million dollars, but in reality we are living with two sluts and a fagit!"