Episode 13 - Sally Makes A Friend

Episode 13 - Sally Makes A Friend (season two)
In this 13th episode, Sally has become offended by one of her friends calling her "Idiot Girl" for no reason. Nowadays, Sally is all sad and lonely and needs a new best friend (which is Monty Monster who makes his first appearence in this 13th episode). Her frowning might only be in this 13th episode because she is too happy to frown in any other episode.