Indecent Proposal

A kid goes to his dad 'whats the difference between potential and reality'
His dad says go ask your mum if she'll sleep with robert redford for One million dollars,
then ask your sister if she'll sleep with brad pitt for a million bucks also.
The young boy does as he's told and returns to his dad.
The father says'What did they say son?'
The kid replies 'they both said yes.....but you still haven't told me the difference between potential and reality'
The father retorts ' Well son, potentially we're sitting on 2 million bucks, but in reality we're living with a couple of slags'.