Riddle: The man who makes it doesn't want it, the man who buys it doesn't need it, and the man who needs it doesn't know it yet. What is it?
Answer: This riddle probably came to prominence during a world war, when the looming inevitability of mortality was around every corner. Quickly put yourself in the shoes of the man who doesn't know he'll be needing "it" and you realize that the answer is a coffin.
The Most Reliable Business Riddle Meme with riddle and answer link.