Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. How can that be possible?
What do we see every day, kings see rarely, and God never sees?
This sparkling globe can float on water. It is light as a feather, but ten giants can't pick it up.
What has a head, a tail, is brown, and has no legs?
I am a room that has a roof but no walls. What am I?