You stop near a cave with a river in front of you. After a long journey with no water anywhere, you are happy to see a vein of fresh water and approach to drink. After quenching your thirst, and bothered by the heat, you decide to go to the cave to take refuge from the sun. You barely enter when you see a man who looks at you curiously.

Who are you? He asks suspiciously.

You don't answer, you don't understand how someone would live in a cave like that. He continues.

I am Zera Yacob. And your name?