A Young Boy And His Parents Lived Near A ZOO...

And whenever he was bored, he would go to ZOO with his mom or dad. One time he was in zoo with his mom and saw a donkey who was erected, He asks his mom, "Mom, what is this?", and her mom says it's nothing.

After a couple of days he goes to the Zoo with his mom again, and saw the erected donkey penis again and asks the same question "Mom, What is this?" This time again the mom says, "I told you it's nothing".

After a couple of days he went to Zoo with his father, and again saw donkey's penis and asks his dad "Dad what is this? I asked mom she says it's nothing". His dad replies "Surely it's nothing for your mum".