A couple took their young son to the circus for the first time. When dad left to buy some popcorn the boy asked, "Mum, what's that long thing hanging off the elephant?"
"That's the elephant's trunk, dear," she replied.
"No, not that!" the boy said.
"Oh, that's the elephant's tail."
"NO, mum, down underneath."
Mother blushed and said, "That's nothing."
His dad returned and mum went to the toilet.
The boy repeated his questions to his father.
"Trunk," said dad.
"No, the thing at the other end."
"It's his tail," said dad.
"No, down underneath!"
The father finally realised what the boy was talking about and said, "Oh, that's the elephant's penis".
The boy thought then asked, "Dad, how come when I asked mum, she said it was nothing?"
The man shrugged and replied:
"Son, I've spoiled that woman."