In a lively market square, where people chattered and chickens clucked, a merchant stood proudly behind his stall. He had some very impressive-looking weapons.

First, he held up a shiny spear. "Gather 'round, everyone!" he called out. "Look at this amazing spear! It's the sharpest, strongest spear you've ever seen. It can poke through *any* shield in the whole wide world! No shield is tough enough for my super spear!"

The crowd ooh-ed and aah-ed. His spear sounded very powerful.

Next, the merchant picked up a big, round shield. "And look at this fantastic shield!" he announced, puffing out his chest. "This shield is so tough, so sturdy, that *no* spear can ever, ever break through it. It’s the best shield for keeping you safe from anything!"

More oohs and aahs came from the crowd. His shield sounded very strong.

Then, a little boy with bright, curious eyes, who had been listening very carefully, piped up. "Excuse me, sir," he said. "If your spear can poke through any shield, and your shield can stop any spear... what would happen if you tried to hit your super shield with your super spear?"

The merchant blinked. He opened his mouth, then closed it. He scratched his head. His face turned a little red. He looked at his spear, then at his shield, then back at the little boy. He didn’t know what to say!

The crowd started to chuckle. They understood! The merchant couldn't have it both ways. His spear couldn't be unstoppable if his shield was also unbreakable when they met.

And that day, the merchant learned that it’s not a good idea to say two things that can't both be true at the same time. It just doesn't make sense!

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