Mister Rogers has a laughing box and shows different ways to laugh. He visits...
Mister Rogers' Neighborhood
Season 21 Episode 3: 1628: Mouthes and Feelings
Mister Rogers shows a video of how people make toothbrushes in a factory. In Make-Believe, Lady Aberlin has some fun pretending to be a tiger with big teeth. Mister Rogers reminds children even with a costume you're still yourself inside.