Season 5: Episode 71: The Non-Fat YogurtWhile at Kramer's new and very popular frozen yogurt store, George runs into Lloyd Braun, a childhood friend and now high-powered advisor to New York City's mayor, David Dinkins. Embarrassed when Lloyd calls attention to a nudge he gives Jerry, George defends himself by claiming that an accident has caused his elbow to move involuntarily. So, when he drops by the Costanzas' with an invitation to see Mayor Dinkins' doctor about the problem, George's grateful mother insists that he accept before telling Lloyd how to contact Elaine. Meanwhile, realizing that they have been gaining weight, Elaine suggests testing the yogurt's fat content, while Kramer's business partners warn Jerry to stop using obscenities around their young son.
Upon discovering that Kramer has made a date with the chemist charged with testing the yogurt, Jerry and Elaine worry about her objectivity. Then, as George complains that the doctor's appointment was made just to embarrass him, Elaine announces that she is going to be dating Lloyd. Although claiming that obscene language will prevent him from growing up to be a successful comedian, Jerry curses Matthew when he destroys a videotape of his latest monologue. Meanwhile, when Elaine suggests that he propose everyone wear nametags to make the city a friendlier place, the idea turns Mayor Dinkins into a laughingstock and costs Lloyd his job
As Jerry learns that the yogurt does have fat in it after all, George is accused by the doctor of lying about his injury. Then, while at the lab with Cheryl, Kramer inadvertently contaminates a blood sample from mayoral candidate Rudolph Giuliani, raising questions about his health. So, worried that the frozen yogurt may be the cause, Jerry calls Giuliani's campaign headquarters with the lab results, prompting the candidate to promise he will cleanse the city of phony non-fat yogurt. Finally, Giuliani rides the frozen yogurt scandal to victory as Kramer's new business turns from an overnight success into an instant failure