The Cosby Show/Say Hello to a Good Buy
From The TV IV
It's time to replace the family's aging station wagon, and Cliff is given the task of picking out the new car. He takes Theo along, presumably to teach him how to haggle with a car salesman and get a good deal. Their task is a tough one: They're dealing with a very experienced salesman who has plenty of tricks up his sleeve to get people into a car they don't necessarily intend to buy. Cliff is hep to each tactic, forcing the salesman to work to secure a deal. However, the whole plan is nearly undermined when a loud-mouthed customer recognizes Cliff in his everyday clothing (Cliff had dressed this way and hoped to avoid talking about his profession, as he sees that as irrelevant to making a deal on a car). However, Cliff remains focused and eventually, the salesman makes an acceptable offer. A new car isn't the only thing that Cliff has to buy. He might have to replace his encyclopedias after Rudy cuts pictures of animals from them...
Clair - her only scene in this episode is in the bedroom