Answer:
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
What runs around all day. Then lies under the bed. With its tongue hanging out?
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?