After a few seconds he turns to his Dad and asks "Dad, what's that hanging down from the elephant?"
His father replies "That's his trunk son."
"No, no, Dad," says the boy, "at the back."
"Oh, that's his tail" replies his father.
"No, Dad," the boy says, "Between his legs."
The father looks over and replies "That's his penis, son."
The young lad thinks about the answer for a minute, and then says to his father "Last week Mommy told me that was nothing."
"Well son," replies his father, "You have to remember that your mother is a very spoiled woman."