An elephant and a mouse

There once was an elephant and a mouse walking casually in Africa. But the mouse wasn't paying attention and fell into a hole.
"Help!" Cried the mouse. "The hole is too narrow and deep so I cant climb out!"
The Elephant, quick witted as he is forms a plan. "Dont panic, I'm going to drop my penis down and you just latch on." So the mouse grabs on and is lifted safely up.
After time has passed a day comes where the elephant falls into a giant hole. "Help!" cries the elephant. "The hole is too deep and i'm too heavy to pull myself out!"
The mouse knows its his time to return the favor. He leaves and he comes back with his BMW and says "when I Back up, just grab the hitch with your trunk and I'll pull you out". So he does so and is lifted out of the hole happy his friend returned the favor.

What is the moral story of this fable you ask?

If you own a BMW, you don't need a big dick.