Age
A young lad is sitting at the table doing his homework.
Dad, he says, "What is the difference between 'potentially' & 'realistically'"?
Father scratches his chin, inhales sharply and says,"That's a tough one; it's probably easier to demonstrate.
Go & ask your mother if she would sleep with the milkman for 1 million quid; then ask your sister the same question"
... 2 minutes later, the lad is back. "Dad, they both said for 1 million quid...? Definitely!"
Well son, says the old man, "There is your answer; potentially, we are sitting on 2 million quid; realistically, we are living with a pair of slags..!