The Big Bang Theory Season 3 Episode 13 : 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. It is revealed that Sheldon considers Howard as an acquaintance and the others as close friends.