This boy went to his father to ask the difference between probability and reality. His dad told him to ask his mother: If someone gave her a million dollars to sleep with Robert Redford, would she do it? Then he told her to ask his sister: If someone gave her a million dollars to sleep with Brad Pitt, would she do that? “Then,” said the father, “come back and tell me what they said.” The boy scratched his head and went off to do as he was told, not understanding what that had to do with his question.
He went to his mom and asked her the Redord question. She shushed him and said, “Yes, but don't tell your father.”

Then he went to his sister and asked her the Brad Pitt question. She said, “Hell, yes, any day of the week.”

“Oh, I get it!” he said as he walked back to tell his dad.

“So, son, what did you find out?” his father asked.

“Well, dad,” the boy replied, “in all probability, we're looking at two million dollars here. And in all reality, we live with two whores.”