When Lord Vishnu performed a Ganesh Puja

Lord Vishnu grew agitated. He could not find his conch - Valampuri. Then he heard someone blowing Valampuri on Mount Kailash. Lord Vishnu prayed to Lord Shiva and asked him to get Bal Ganesha to return the conch.  Lord Shiva advised Vishnu to perform a Ganesh puja. Lord Vishnu agreed. The merciful Lord Ganesha returned the conch.  The form of Lord Ganesha that returned the Valampuri is known as the Valampuri Ganesh who is depicted with his trunk facing right instead of the customary left. 
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Bal Ganesha and the Cat

Little Ganesha played roughly with a cat and hurt it. He then ran to his mother only to discover that she had a wound exactly at the place where he had hurt the cat. It was "I who had assumed the form of a cat to play with you," said the Mother of the Universe. It is the Goddess herself who becomes all beings, and we should therefore desist from hurting anyone by word, thought or deed. Little Ganesha learned his lesson that. Did you? 

Image Courtesy: Google