A couple take their small son to the circus. The boy's father wanders off a bit and so it falls to the boy's mother to answer questions.

The boy points to an elephant and asks: "What's that?". His mother, thinking that he is referring to the elephant's tail. says: "That's his tail." The boy says: " No, I mean what he has under his tail". His mother is somewhat embarrassed and replies: " Oh, that's nothing".

A little while later the little boy's father rejoins them. The boy asks his father what that is under the tail of the elephant. The father wants to be conscientious and says carefully: " That's a penis".

The little boy says: " Gee, Mom said it was nothing!".

The father sighs: " I have spoiled that woman!"