Jerry accidentally knocks his girlfriend Jenna's toothbrush into the toilet, and she uses it before he can tell her. Since she is as fastidious about cleanliness as him, he is afraid to tell her afterwards. He directs Jenna to sterilize her mouth with various cleaning agents, but can't get over his fear that she may still be unsanitary and can't kiss her. Jerry tells Jenna about the toothbrush; angered that he didn't tell her sooner, she locks him out of his apartment and tells him she stuck something of his in the toilet. Jerry throws away everything he owns that could have even partially fit in the toilet, unable to trust it is clean.