Brian and
Stewie visit the local Quahog bank so that Brian can deposit money in his
safe deposit box. Stewie then wants to go to a store to return a $3,000
Thom Browne sweater. They are still inside the vault until the door closes at the end of the work day, locking them inside. Frightened, Stewie soils his
diaper. Worried he will get a
rash from the dirty diaper, Stewie desperately tries to make Brian
eat his feces by threatening him with a
gun that Brian had stored in his deposit box. They discover that Stewie has a
cellphone in his pocket, with only enough charge in the battery for one short phone call. Stewie uses the last of the phone's battery charge to call the clothing store rather than for help. Furious, Brian slaps Stewie, smashes his phone, and yells at him, making him cry. Instantly remorseful, Brian reluctantly agrees to eat Stewie's feces as a way of apologizing. While watching Brian eating, Stewie becomes nauseated and throws up; Stewie then convinces Brian to eat his vomit. Realizing that he has nothing to clean his bottom with, Stewie manages to convince Brian to clean him with his tongue in order to avoid infection. Afterward, they both decide to take a nap, but soon they realize that the next day is Sunday, meaning that they will have to wait another day before they can be released from the vault. Awaking from his nap, Brian decides to drink a bottle of
Glenfiddich scotch whisky that he had stored in his deposit box. He offers Stewie a sip, and they both become so drunk that Brian agrees to pierce Stewie's ear with a pin from his sweater, leaving him with a bloodied ear for the rest of the episode. While talking, Brian revealed he
voted for John McCain in 2008. Stewie and Brian discuss
The Dog Whisperer and
Cesar Millan, and Brian explains that he is inspired by Millan's philosophy about dogs' instinctive ability to live in the present and with purpose. Stewie, however, points out that Brian himself does not appear to live with any specific purpose. Enraged, Brian begins insulting Stewie, who furiously retaliates by revealing that he could have gone all day without having his diaper changed, and only thinks of Brian as a passing amusement and "the best of a bad situation". Stewie dares Brian to shoot him with the revolver in the deposit box. Stewie prematurely causes the gun to discharge, causing the bullet to randomly
ricochet off the vault walls, forcing the two under the table to wait for the bullet to stop. After sobering up and eating energy bars that were in Stewie's bag, Stewie asks Brian why he has a gun, noting that Brian is a staunch
gun control proponent and seems to be the last person who would ever own a firearm, even mentioning how Brian cried after the
Columbine massacre. Brian refuses to talk about it at first, but eventually admits that he has the gun in case he ever wants to commit
suicide (although he clarifies that he came to the bank only so he could shore up his Christmas savings). He confesses that due to his
anthropomorphism, he cannot find his purpose in life like other dogs, and finds comfort in knowing he has the option of killing himself; the scotch bottle was intended to serve as a last drink. Though visibly shocked by the revelation, Stewie snaps at Brian, saying that he would be lost without Brian, claiming he is the only person in the world that he really cares about; he admits that his earlier assertion that he did not care about Brian was out of retaliation for Brian's insults, and both admit that they care for each other as friends. Stewie adds that maybe making someone else happy is enough, because it is the best gift one person can give. Stewie falls asleep as Brian reads the beginning of
David Copperfield to him. The following morning, the vault door opens, and Brian silently carries a sleeping Stewie and their belongings out of the room. ==Production and development==