Answer:
How many months of the year have 28 days?
It belongs to you but you don’t use it. It does not belong to other people but they use it. What is it?
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
What is it that given one, you'll have either two or none?
A setting that proved to be deadly for Abraham Lincoln.
How did the farmer find his wife?