Just felt like sharing a joke i heard today

So, a little boy asks his father "what's the difference between theoretically and realistically" Dad says "that's hard but i have an idea. Ask your mother if she would sleep with the mailman for a million" the little boy trots off and comes back a few minutes later.. "mum said 'yes', dad". Dad says "ok, so go an ask your sister if she'd sleep with the garbage man for a million" The little boy rushes off and a few minutes returns again. "She would, dad!" Dad looks the boy in the eye and says, "Ok son, theoretically were sitting on 2 million but realistically we're living with a couple of skanky whores".