Mister Rogers has a laughing box and shows different ways to laugh. He visits...
Mister Rogers' Neighborhood
Season 21 Episode 2: 1627: Mouthes and Feelings
Mister Rogers plays with tubes to create different sounds. A friend tells the story of "Button Broth." In Make-Believe, Lady Aberlin does research on how the neighbors react to a laughing box. Some are afraid that there's a person inside.