What happens if a turtle is flipped over?

It walks away.

No, seriously. Putting a turtle on its back causes gravity to act in the wrong direction on its organs. It is very uncomfortable fore the turtle, and can lead to death. How long do you think you would last if someone hung you upside down by your heels, with the weight of your intestines and other organs resting on your diaphragm and lungs?

Think about it.