Pino is a mustard brown monster who learns to share and play with others through the Sesame Street song "Don't Be a Bully". At the start of the sketch, Pino barges in on three monsters who are playing peacefully in the playground, and takes their ball. When Narf asks for the ball back, Pino refuses, shouting, "ME ball!"
Narf calls Pino a bully, which confuses him -- he doesn't know what bully means. Narf explains in song, which inspires Pino to mend his ways and become a friendly monster.