S11E18: Days of Wine and D'oh'ses

In "Simpsonlar - S11E18: Episode 18," titled "Days of Wine and D'oh'ses," the episode wraps up with Barney Gumble attempting to turn over a new leaf by giving up alcohol. He joins Alcoholics Anonymous, hoping to stay sober and improve his life. Meanwhile, Bart and Lisa are busy trying to win a photo contest, which leads to some sibling rivalry. Barney, motivated by his new lifestyle, takes helicopter flying lessons and offers to help Homer with a rescue mission when Bart and Lisa's hot air balloon adventure goes awry. Their balloon, naturally, ends up stuck on the side of a mountain. Barney manages to save them with his new piloting skills, proving that maybe sobriety isn't so bad after all. In the end, Barney's resolution to remain sober is tested during a celebration at Moe's Tavern. Despite the temptations surrounding him, Barney sticks to his guns and opts for a non-alcoholic beer instead. The episode closes on a hopeful note for Barney's future, while Bart and Lisa's sibling rivalry is momentarily set aside after their harrowing experience.