Ganesha and Krauncha

The musician-god Krauncha once stepped on a sage's foot by accident. He apologized, but the angry sage cursed him to become a gigantic mouse!
Krauncha begged for mercy, but the sage could not take back his curse. As compensation, he promised that someday even the gods would bow to Krauncha.
The giant mouse stepped on the sages' ashrams, crushing their homes with his feet.
Finally, Ganesha used his lasso to catch Krauncha, who begged for mercy.
Ganesha agreed and made Krauncha his vahana.
This fulfilled the sage's promise: when the gods bow to Ganesha, they are also bowing to Krauncha.

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Inspired by: various Internet sources
Notes: The sage who cursed Krauncha is Vamadeva.

(Ganesha on his vahana)