Then, when the merchants had set up their stalls full of food, Tortoise and Rabbit hid in the tunnel, making terrible noises. "Ubwaw tiiiiinjiiiin!" they shrieked. "UBWAW TINJIN TIN-TIN-TIIIIN!"
The people thought evil spirits had invaded the market and ran away.
Then Tortoise and Rabbit emerged, took all the food they could carry, and escaped back through the tunnel.
They did this again and again; the more often they did it, the more convinced the people became that the market really was haunted.