A boy is working on his English homework and asks his father for some help. "Dad, what's the difference between 'potential' and 'reality'?"
His dad replies, "I'll tell you what. Go ask your mother if she'd sleep with Robert Redford for a million bucks. Then go ask your sister if she'd sleep with Brad Pitt for a million bucks. Once you have their answers, you'll know the difference."
So the boy goes to his mother and poses the question: "Would she sleep with Robert Redford for a million bucks?"
She answers, "Don't tell your Dad, but yes, I certainly would!"
The boy then goes to his sister and asks her his next question: "Would she sleep with Brad Pitt for a million bucks?"
"Oh definitely!" she answers, without a moment's thought.
The boy goes back to his father, an expression of understanding on his face.
"You're right, Dad, I know the difference now. Potentially, we're sitting on two million bucks. In reality, we're living with a couple of sluts."