Stupid humour for no reason whatsoever.

A young boy went up to his father and asked him, "Dad, what's the difference between potentially and realistically?"

The father thought for a moment, then answered, "Go 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. Come back and tell me what you learn from that."

So the boy went to his mother and asked, "Mom, would you sleep with Robert Redford for a million dollars?"

"You bet," the mother replied. "I wouldn't pass up an opportunity like that."

Next, the boy then went to his sister. "Would you sleep with Brad Pitt for a million dollars?" he asked.

Replied the sister, "Oh my God! I would just love to do that! Of course!"

The boy pondered that for a few days, then went back to his dad. His father asked him, "Did you find out the difference between potential and realistic?"

The boy thought for a moment, then replied, "Yes, sir. Potentially, we're sitting on two million dollars. Realistically, we're living with a couple of sluts."