"Monster in the Mirror" is a Sesame Street song sung by Grover. In this song, Grover wakes up one morning and sees a monster in his mirror (his reflection). Instead of being scared, he sings, "Wubba wubba wubba wubba, woo woo woo." The clip features a number of camera tricks, such as a sequence in which a full-body Grover walks in front of a mirror showing his animated reflection. At the end of the song, Grover has his arm around his reflection. A shortened version of this song was sung in episode 4067, although Elmo referred to it as "The Wubba Wubba Wubba Song."