"Bubbles!" is one of the Oobi shorts.
Grampu is outside with Oobi and Uma. After showing them a bubble wand and a dish of soap, Grampu blows a few bubbles. While the bubbles fly around, a strumming harp plays in the background. Oobi and Uma are amazed, and they ask to take turns with the bubble wand.
Oobi takes a turn first, then Uma. Harp music plays every time they blow bubbles. After Uma's turn, Kako walks by. Grampu asks if he wants to have a turn. Kako looks at the dish of soap and decides to take a "bubble bath" by splashing around in it. The others are confused at first, but they all laugh with Kako.
Most of the audio and the last 15 seconds of footage have been found. The footage is below, and the audio can be played here.