I am not so sure about the title, but I will take the credit for the conversation.

Son:  Dad, I don’t like riding my bike on hills, why do we have hills?

Father:  Son, we have hills so you can learn to have courage and strength to ride up them, so you learn to appreciate the view from the top of them, and so you can learn to have fun riding down them!

This was the conversation I had with my 5 year old son on our regular bike this morning.  It didn’t seem to fall on deaf ears… and I think it is original.