Answer:
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
A blind man enters a maze, and the entrance closes behind him. His only way out is to solve the maze. A long time passes, and he exits the maze through the correct exit. How did he solve the maze?
What kind of running means walking?
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
I have rivers without water. Forests without trees. Mountains without rocks. Towns without houses.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.