Build a movie plot around this: Where was Bart when Homer was driving the motorcycle? In the side-car.
While performing on Lake Springfield, music group Green Day perished when the lake's pollution dissolves their barge, following an audience revolt after frontman Billie Joe Armstrong proposes an environmental discussion. At their memorial, Grampa Simpson foresees the destruction of the town, but only Marge takes this seriously. Later that day, Homer dares his son Bart to skate naked to the Krusty Burger restaurant and Bart is arrested by Chief Wiggum. Bart considers their neighbor Ned Flanders a better father figure after Homer refuses to take responsibility for the incident. Lisa and a new Irish friend named Colin convince the entire town to clean their lake.Meanwhile, Homer adopts a pig from Krusty Burger and names it "Spider Pig" (later "Harry Plopper", and simply "Plopper"), and stores the pig's feces (and some of his own) in a silo, until Marge tells him to safely dispose of the waste. Homer intends to take his silo to the waste management plant, but after Lenny calls to tell him that Lard Lad Donuts has been shut down and is giving away free donuts, Homer impatiently dumps the silo straight into the lake, polluting it worse than before. Moments later, a squirrel jumps into the lake and becomes severely mutated; Flanders and Bart (who bond after Homer humiliates Bart) discover the creature before the EPA captures it. Russ Cargill, head of the EPA, presents five "unthinkable" options to U.S. President Arnold Schwarzenegger to keep the town's pollution contained; the slow-witted president, doesn't bother reading number 3 before picking it; enclosing Springfield in a large glass dome. When the police discover Homer's silo in the lake, and his responsibility for sealing Springfield in the dome, an angry mob advances on the Simpsons' home to kill Homer, but the family escapes the town through a sinkhole, which then destroys their house. With the EPA on their trail, the Simpsons flee to Alaska. On the way, Homer tries to make some money at a carnival by riding a motorcycle around the inside of a metal...