So Funny I Forgot to Laugh

Unreleased "So Funny I Forgot to Laugh" is the first half of the tenth episode of season 16. It will air on May 10th, 2013, along with "The Best Day Ever."

Synopsis
Sue Ellen receives a yak wool sweater from her Tibetan pen pal and begins wearing it, only to have Arthur continually make fun of her for looking like a sheep dog. His friends alienate him for his bullying until he realizes his mistakes.