Sesame Street - Cookie Monster and Prairie Dawn demonstrate Open and Closed

From Season 27. Prairie Dawn demonstrates the word of the day, "closed", by closing three tin cookie containers. Cookie Monster desperately wants the cookies, but must wait until Prairie is done. Once the lesson is over, Cookie attempts to open the boxes, but finds that all of them are stuck. Undaunted (and not wanting to wait until the word of the day is "open"), Cookie eats the cookies and the containers.