Marge and Homer wind up at a curling rink when their plans for a date night fall through. They both discover their innate talent for the sport - particularly Marge, who has years of experience sweeping floors. Agnes and Seymour Skinner invite Marge and Homer to join their team. Agnes, however, cautions Marge not to let emotions get in the way of winning, relating how a fetal kick by an unborn Seymour foiled her chances at winning gold in pole vault at the Helsinki summer olympics in 1952. Nevertheless, the Simpson-Skinner team qualifies to compete in the demonstration sport of mixed-doubles curling at the Vancouver 2010 winter olympics. When they arrive in Vancouver, Homer overhears Agnes state that she wants Homer off the team. Marge insists she can compensate for his weak throws, but injures her right shoulder while sweeping. She is told that she will never curl again and that the American curling team must concede defeat to Sweden. Marge reveals that she is left-handed and by sweeping with her left arm, leads her team to victory. At the end, she and Homer agree that they had a great date night.
Meanwhile, Lisa discovers she enjoys collecting olympic mascot pins but her interest in them quickly spirals out of control. She trades her pearl necklace to a vendor in exchange for a pin from the 1924 Winter Olympics in Chamonix, France. When Bart discovers Lisa busking on a street corner, he decides to retrieve her necklace. He tricks the pin vendor with "Fatov", the mascot from the 2014 olympics in Sochi, but this mascot is really Homer's jowls, clipped from his driver's license. Bart gives Lisa her pearls and offers to help her kick her pin-collecting addiction.