The old man immediately retorted, "Young man, don't underestimate me. Ask me another question!"
Knowing he was clearly eager to show off his wisdom, I couldn't help but smile as I presented him with a new challenge. "In a city, there's a street with only one barber. A nobleman gave him this order: he must cut the hair of everyone on the street who doesn't cut the barber's hair, or else he'll be killed. Now, should the barber cut his own hair?"
If the barber cut his own hair, he broke the noble's rule, and he would get killed. But if he didn't, he still disobeyed the order and faced the same fate. This conundrum was known as the Barber Paradox.
The old man looked bewildered after hearing this. The more he pondered, the more perplexed he became. Holding his head, he exclaimed, "How can su
