There is a difficult item to find on the streets. Near the start you can see a phone box. Enter it and call Moe's Tavern (opposite). He will appear wearing a purple "dress". When Bart tells him a joke, he takes a psyke and dives at you. Spray him, then jump. At exactly 4:00, some purple wearing people will leave the theater. Spray them. There is a man near the statue of Jebidiah Springfield to spray.