Homer gets grungy when he becomes a sideshow performer at Hullabalooza, an alternative rock festival that features Sonic Youth, Smashing Pumpkins, Cypress Hill and, uh, Peter Frampton. Homer's performance consists of using his enormous gut as a target for cannonballs, which makes him a huge hit with the pierced and tattooed Hullabalooza crowd. It also gains him the respect of his kids, who finally think that their dad is cool. When a doctor tells Homer that he is causing permanent damage to his internal organs, Homer must decide between his newfound acclaim as a sideshow freak or long-term health. Luckily for all, Homer chooses the latter, and leaves the life-threatening stunt to someone else.