Answer:
How can you throw a ball as hard as you can, to only have it come back to you, even if it doesn’t bounce off anything?
What is so delicate that even mentioning it breaks it?
What can be measured but has no length, width or height?
I can be as thin as a picture frame but my insides have many things you can see.
What is it that no man ever saw, which never was, but always will be?
It is something you will never see again.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?