I remember that episode as a kid. Telly first rushed into Hooper's store asking Mr. Hooper to plug something in for him, then Telly ran off. Mr. Hooper and David followed the cord and found Telly sitting on the outside table watching TV, he went, "Shhh! I'm glued!" And then introduced himself as Telly Monster. David and Mr. Hooper went, "TELLY MONSTER?"