One day when Rama was sitting on his throne, his ring fell off. When it touched the earth, it made a hole in the ground and disappeared into it. It was gone. His trusty henchman, Hanuman, was at his feet. Rama said to Hanuman, "Look, my ring is lost. Find it for me."
Now Hanuman can enter any hole, no matter how tiny. He had the power to become the smallest of the small and larger than the largest thing. So he took on a tiny form and went down the hole.