Sometimes a cartoon show takes you by surprise. Sure, it handles a lot of topics, social situations, etc. But sooner or later they are sure to stumble onto GOLD! .. aka. A topic that is relevant to A viewer! Its PROBABLY from personal experience, but this episode just hit home. Sure, who hasn't been seeing someone, who has a sibling that is somehow very interesting... for whatever reason. So, they stumbled onto Linda's SISTER, who shows up and a doped up Bob think she is Linda, resulting in this pantomime-like "farce". It might help, that some viewers might also hate dentists. This is the Sister-Dentist episode. So good. I am watching it again!