It's Career Day, and a variety of career exhibits have set up shop throughout the school. Marcus feels sorry for Buford. No one seems interested in his janitorial exhibit. Marcus guilts the gang into visiting by reminding them how helpful Buford has been in their past adventures. Pleased by their visit, Buford enthusiastically tells the kids about his general duties. He gets into plumbing, explaining such things as clogs, traps, sewer gas, etc. But the kids show no interest. Buford picks up on this and slinks off, his feelings hurt. Marcus is angry with his friends. Made to feel guilty, Ruby argues with him. She really likes Buford, but she doesn't think that he should be pushing sanitation engineering as a career. Making a living in a sewer? ""Come on, what kind of a crazy person would want to work underground for a living?"" Earl is outraged! He works underground for a living, and he's certainly not crazy! He transforms the school into a sewer, complete with noxious sewer gas, bursts