Elmo's World/Nonagon (by They Might Be Giants)

Cast

 * Big Bird, Ernie, Bert, Cookie Monster and Kermit the Frog as They Might Be Giants

Lyrics
Big Bird: Everybody at the party is a many-sided polygon When a guest arrives, they will count how many sides it has on Standing by the window over there There is a shape with four sides so it's a square And the one who has nine is looking fine And its name is Nonagon

Ernie: Everybody turns just in time to see the pentagon arrive Counting up the sides, it is clear the pentagon has five Chatting in the kitchen we see There is a triangle whose sides number three And is talking to the shape that has nine Who is known as Nonagon

Bert: Nonagon

Cookie Monster: Nonagon lets in a guest who has shown up late Its name is Octagon and its sides add up to eight Turning the music on Is a six-sided hexagon And they all get in a line and do A dance called "The Nonagon"

Kermit the Frog: The Nonagon The Nonagon