Answer:
When one does not know what it is, then it is somethingอพ but when one knows what it is, then it is nothing.
David's father has three sons: Snap, Crackle and?
Dragons are known to do this to their gold.
A Chinese, Indian and a Swiss were going to a party. Who is most likely to bring a plus one?
Never swallowed but certainly chewed, tossed in the mouth but it is not food. What is it?
I am the same written forward backward and upside down.
Kids
Animal
Difficult
Easy
Food
Funny
Logic
What am I?