Osomatsu-kun S01 E04 Sheee! I'm a Ballerina!

"You're seeing way more than double! Try sextuple!"

Chibita is training to become Prima Donna in Iyami's ballet studio's big show. When one thing leads to another and he's ousted from his role by Osomatsu, Chibita throws away his heart (literally) and causes mischief for the big recital.