David and Linda Howard are successful yuppies from LA. When he gets a job disappointment, David convinces Linda that they should quit their jobs, liquidate their assets, and emulate the movie Easy Rider, spending the rest of their lives travelling around America...in a Winnebago! (This is a kind of large, luxurious mobile home which suits a 1980's yuppie more than the counterculture dropout approach of Easy Rider.) His idealized, unrealistic plans soon begin to go spectacularly wrong.

Homer adopts a pig who's run away from Krusty Burger after Krusty tried to have him slaughtered, naming the pig "Spider Pig." At the same time, the lake is protected after the audience sink the barge Green Day are on with garbage after they mention the environment. Meanwhile, Spider Pig's waste has filled up a silo in just 2 days, apparently with Homer's help. Homer can't get to the dump quickly so dumps the silo in the lake, polluting it. Russ Cargill, the villainous boss of the EPA, gives...