A mother is walking with her five year-old son through the zoo when they reach the elephant cage. The boy looks with amazement at the large beast and asks his mom, “What's that long thing hanging down from the elephant?”
His mother replies, “That's his trunk.”
The little boy goes, “I know that, the thing to the other side of the trunk.”
The mom replies, “Oh, that's his tail.”
The boy goes, “I know that! No, what's that big thing hanging down in between the trunk and tail.”
The mother, wanting to avoid this subject all together, just says “Oh, that's nothing,” and whisks him off to the next exhibit.
Two weeks later he goes to the same zoo with his dad. They are at the elephant exhibit and he asks his dad, “What's that long thing hanging down from the elephant?”
The dad replies, “That's his trunk.”
“No, behind that!” says the kid.
“Oh, well that's his tail,” replies the father.
“No, in-between the trunk and the tail!” yells the kid.
His dad replies, “Son, that's the elephant's penis.”
The kid, a bit puzzled, tells his dad, “But Mom said it was nothing.”
His father replied, “Son, that's because your mom's been spoiled.”