Answer:
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.
Which button does not function when being pressed?
A morbidly-named body of water
What word in the English language uses all five vowels plus Y in alphabetical order, and uses each only once?
What can be forever wound up but never annoyed?
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?