Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
Some adults still use these to count.
The King of Pop's stellar dance move
They are two brothers. However much they run, they do not reach each other.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
I go in hard come out soft. Blow me hard and I’ll make a pop.