Bop 'til You Drop
T11, E105: After Baby Bop loses her pink balloon, her friends give her a whistle to signal for them to play together. When she becomes too bossy, Barney teaches her the importance of being a good friend.

T11, E105: After Baby Bop loses her pink balloon, her friends give her a whistle to signal for them to play together. When she becomes too bossy, Barney teaches her the importance of being a good friend.