Billy the Bull



In the Mopatop's Shop episode "Horns" Billy the Bull sent a puzzle to Mopatop, "How can a bull play a tune on a bicycle", if Mopatop are able to answer the puzzle with something from the shop Billy would reward Mopatop with a prize.

When Billy arrived to the shop he liked Mopatop's answer so much that he played a tune while riding on a bike around the shop.