Answer:
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
Hold the tail, while I fish for you.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I have a neck but no head. I have a body but no arm. I have a bottom but no leg.
What covers its face with its hands, speaks no language, yet most known what it's saying?