Once a crow stole a vadai from a vendor. It wanted to eat it. So it flew away to a tree nearby. It was about to eat it. Then a hungry fox passing by saw it. He decided to have the vadai. "Oh! my dear crow," He said to the crow, "How beautiful you are! your feathers are really shiny. surely your voice must also very sweet. please sing a song for me." The foolish crow opened its mouth to sing. The vadai fell down. At once the clever fox picked it up and ran away with it. 
Don't fool other. Otherwise you will be fooled. 