A kid goes up to his father. "Dad, what's the difference between
"essence" and "reality"? The father thinks for a moment. "Son, you go up
to both your mother and sister and ask them if they would sleep with a
total stranger for a million dollars."

The kid leaves the room and comes back a few minutes later.

"They both said yes" he tells his father.

"I will now explain to you the difference between "essence" and "reality"
" says the father. "In essence, we are sitting on two million dollars,
but in reality you have two whores for a mother and sister."