Kramer and Jerry are not pleased with the new “low-flow” shower heads that the building’s maintenance department has installed. Elaine is surprised to find out that opium was present in the urine sample she gave at her physical in preparation for her trip to Africa. Mr. Peterman, once an opium addict himself, tells Elaine that she will not be able to accompany him to Africa after all. Jerry’s Uncle Leo complains about an overcooked hamburger and says the cook is anti-Semitic, which Jerry jokes about on the Tonight Show. Leo’s girlfriend laughs at this, Leo calls her anti-Semitic, and they break up. Elaine discovers her opium results were from her eating poppyseed muffins.