"Petarded" is the sixth episode of the fourth season of the American animated television series Family Guy. It originally aired on Fox in the United States on June 19, 2005. It was written by Alec Sulkin and Wellesley Wild and directed by Seth Kearsley. In the episode Peter takes the MacArthur Fellows Program test to see if he is a genius. However, he performs so poorly that he is declared technically mentally retarded. Attempting to take advantage of the situation, he accidentally hospitalizes Lois while attempting to steal from a restaurant and loses custody of Meg, Chris, and Stewie.