trivia

For the new animers and old what am is this from Once upon a time a young boy posed a question to the great ruler of monsters why do you always stare down at the world so sadly arent you happy the ruler replied if you promise to grant my wish then i will stop being sad but i should warn you if you ever break the promise youve made to me then i may devour even so will so still promise me despite that i will said the boy with a nod then i will tell you my wish (HINT: Dance)