Answer:
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
What gets beaten, and whipped, but never cries?
They belong to me; they belong to you; They can make you feel happy or make you feel blue; They never end until the day you do.
You can see nothing else, When you look in my face, I will look you in the eye, And I will never lie.
The strangest creature you'll ever find: Two eyes in front and many many more behind.