Tenali Rama

Once upon a time, the king said, "If you can stand in cold water a whole night you will be given a bag of gold."

Then an old man agreed to stand in cold water. Next morning, the king asked the man, "how could you stand in cold water the whole night?"

The man answered, "there was a candlelit far away and by seeing that I stayed in the water for the whole night." 

Then a man said, " He will not take money as he had taken the heat of a candle." 

Then Tenali Rama said," Ok, now you go and stand in cold and we would lit a candle there."

Then the man realised his mistake and the old man was given a bag of gold.