A young boy goes up to his dad and asks "Dad, what's the difference between potentially and realistically?"

"Well son," says the boys father "ask your mother if she'd sleep with Robert Redford for a million pounds, then ask your sister if she'd sleep with Brad Pitt for a million pounds, then come and tell me what you've learned."

So the boy asks his mother and she says "Oh yes, I'd be crazy to pass up an opportunity like that." Then the boy asks his sister and she says "Brad Pitt? I'd sleep with him for free. The million pounds would be the icing on the cake."

The boy mulls this over for a few days and then goes to see his father.

"So son," says his father "what have you learned?"

"Well," said the son. "Potentially we're sitting on two million quid but realistically we're living with a pair of slappers."

"That's my boy!"