[#] 5 [Episode title] The Half Wit [Air date] Unknown [Summary] 
Jesse wants to be the funniest kid in class, so he memorizes a joke book of insults. His popularity makes him to be invited to Mary-Ellen's birthday party, but then he runs out of insults and decides to use his own stuff - with disastrous consequences. Meanwhile, Arthur loses his ring and, in order to find it, he's hired to the Lost and Found office where Polly and Mr. Besser work. He manages to get Polly to get out of his way and keep all of the lost things to himself.