In the town of Fogsville, every house had a unique lock requiring a special code. One day, a visiting merchant wanted to enter a friend's house but forgot the code. When he knocked, a voice from within asked, 'What can you add to a barrel to make it lighter?' The merchant answered correctly and the door opened. What did he say?
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The Answer
A hole.
Here's why: the wordplay lies in the counterintuitive idea that adding a hole reduces the weight by allowing contents to escape, making it 'lighter'.
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