When Penny's cable gets cut, she starts coming over to the guys' apartment to watch America's Next Top Model. However, Sheldon bans her from the apartment for a series of petty infractions, such as touching his food, sitting in his spot, and sending him "email humor" about a cat "who wants to haz cheezburger". After a series of escalating pranks, including Sheldon cutting off Penny's access to WiFi and Penny wrecking Sheldon's "laundry night", Sheldon goes to the extreme of hanging her laundry from a telephone wire outside his apartment. Leonard decides to help Penny end the war, and gives her Sheldon's "Kryptonite": his mother's phone number. Subsequently, Sheldon's mother calls him and forces him to apologize to Penny.