The Bozeman Reaction

When their apartment is robbed and their TV, video games, and computers are stolen, Leonard and Sheldon turn to Howard to create a state-of-the-art security system, which includes an electrified net over the door. Sheldon gets caught in that net and decides he needs to leave Pasadena. He gets online and rules out several cities for different reasons, including Enid, Oklahoma, and Boone, North Carolina. He rules out all of Nebraska because Penny is from there. He decides on Bozeman, Montana, but gets robbed as soon as he arrives there, so he comes back to Pasadena.

Title reference: Sheldon's reaction after their apartment is robbed. He moves out and travels to Bozeman.

Trivia

 * During this episode Sheldon begins to keep a journal, in which he continues to make reference to the "crime-ridden streets" of Pasadena. This journal is very similar in style and content to the journal of Rorschach from the Watchmen comic book miniseries and film.