Kermit's Lectures: Kermit and Cookie Monster demonstrate what it is to be happy, angry and sad. Kermit gets angry when Cookie Monster eats the happy face that Kermit provided, Cookie Monster feels sad when Kermit threatens to tell Cookie's mommy what he did, and that makes Kermit happy because he was able to do his demonstration without the tasty styrofoam faces.
Film: A kid taking a shower explains how animals, people, and things get clean. (First: Episode 0001)
Ernie and Bert: Ernie invents a machine that makes A's -- you turn the crank over here, you push the button on top, and out comes an A. But it doesn't work when it rains -- it only makes A when the sun shines. (First: Episode 0006)
Ernie and Bert: Bert has a number 4 in his hand, and asks Ernie what it is. Ernie doesn't know, and guesses that it's a chocolate pie. Bert decides to cut to a film about the number 4, so that Ernie can get a clue. When the clip is over, Ernie makes another guess: a cream pie. "If this is a cream pie, then what is this?" asks Bert, while he pulls out a cream pie. "That's a four!" Ernie grins, and Bert pushes the pie in Ernie's face. "I knew it was a pie," Ernie remarks to the camera, "but who wants to be hit in the face with a number four?" (First: Episode 0006)