Jerry, Elaine, George, and Newman are fixated on a new frozen yogurt shop in which Kramer has invested. They are delighted by the fact that the yogurt is advertised as non-fat. Jerry swears near the shop owner's son Matthew, who then starts to swear frequently. Matthew's mother brings him over so that Jerry can explain to him that cursing is wrong. However, Jerry has a cassette tape of a particularly successful ad-libbed set from a comedy show the previous night, and curses at Matthew again when he destroys it. When Kramer notices that Jerry and Elaine have gained weight, they become suspicious that the yogurt may not be non-fat, so they send it to a laboratory for testing. At the lab, Kramer flirts with one of the technicians, worrying Jerry, who fears their relationship might interfere with the test's results. George runs into his childhood nemesis Lloyd Braun and makes a derisive nudge to Jerry. When Lloyd notices, George pretends that it is an involuntary spasm caused by an injury. George then has to fake the spasm repeatedly. Lloyd refers him to a doctor, who concludes that George is faking it. As he leaves the doctor's office, George bumps his elbow on the desk and experiences a real spasm, which worries him. Elaine starts dating Lloyd, who works as an aide to the mayor of New York City David Dinkins, who is running for re-election against Rudy Giuliani. Elaine suggests an idea for everyone in New York to wear name tags in public. After three days without a phone call, Elaine believes Lloyd dumped her due to her weight gain from the frozen yogurt, but she learns from Kramer and a news report that Lloyd made Dinkins a laughing stock with her name tag idea and was fired. Kramer and the lab technician make out at the lab after hours, and accidentally knock a sample of blood into a test tube of Giuliani's blood. This causes Giuliani's results to show he has a high level of cholesterol. Having eaten lots of the supposedly non-fat frozen yogurt lately, Jerry and the others suspect the yogurt is to blame, as the lab results show that the yogurt does, indeed, contain fat. Jerry phones Giuliani's headquarters with the tip, and in a following press conference, the prospective mayor promises a crackdown on false advertising. The issue ignites voters, and Giuliani wins the election. When Jerry's local frozen yogurt shop switches to real non-fat yogurt, it tastes awful and business plummets. Matthew curses at Jerry for ruining his father's business.