One day, at the zoo...

Little Johnny and his mother go to visit the zoo. They visit the Reptile House, Monkey Island, Chimpanzee Forest, and the Avian Habitat. As they're walking toward the exit, they pass the Elephant Sanctuary. 

Little Johnny points to the elephant and says, "Mommy, what's that thing hanging down from the elephant?"

The mother replies, "That's the elephant's trunk, dear."

Johnny points again and says, "No, that OTHER thing!"

The mom's starting to get a little nervous, but she replies, "Oh, that's the elephant's TAIL."

Somewhat frustrated, Little Johnny says, "No - that OTHER thing, hanging down between the elephant's legs!"

Mom, in a hurry to get to the car before rush hour (and, just a little embarrassed and not wanting to get into an anatomy lesson), says, "Oh, that's nothing."

The next day, she has to work and the dad has the day off. She tells him that they ran out of time at the zoo, and there was still a lot more for Little Johnny to see, so Dad takes him back to the zoo.

They visit the Komodo dragons, the Zebras, the Lions and Tigers and Bears (oh, my).  Finally, they walk by the Elephant Sanctuary.

Little Johnny points to the elephant and says, "Daddy, what's that thing hanging down from the elephant?"

The father replies, "That's the elephant's trunk, bud."

Johnny points again and says, "No, that OTHER thing!"

Dad, not quite sure what Johnny is pointing to, replies, "Oh, that's the elephant's TAIL."

Somewhat frustrated, Little Johnny says, "No - that OTHER thing, hanging down between the elephant's legs!"

The dad says, "Did you and mommy visit here yesterday?" 

"Yes, daddy."

"Did you ask your mommy what it was?"

"Yes, daddy."

"And what did she say?"

"She said it was nothing."

"Ah," the dad replies. "Your mother's spoiled."