Answer:
I hide but my head is outside.
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
There is someone, and there is always another, for without the other, there wouldn't be one
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
What goes up but never comes down?
what is a duck that is in Starbucks?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?