Answer:
What calls for help, when written in capital letters, is the same forwards, backwards and upside down?
What has feet on the inside but not on the outside?
What cannot talk but will always reply when spoken to?
Whipping one of these out in the wrong setting is said to be terrible luck.
What has thousands of ribs and two backbones?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.