A question a film reviewer gets a lot is, “What’s your favorite movie?” I’ve known the answer for 40 years, and my decision has never wavered: “Singin’ in the Rain.” It is impossible to watch this peerless example of Golden Age Hollywood musicals without feeling happier, energized and deliriously alive. Gene Kelly plays Don Lamont, a 1927 matinee idol shaken when talkies hit town like an earthquake. He proves more than a triple threat as dancer, singer and actor. He’s also an inspired director, sharing behind-the-camera responsibilities with Stanley Donen. Jean Hagen is all dim narcissism as Don’s scheming co-star, Donald O’Connor is his rubber-limbed sidekick, and Debbie Reynolds is daisy-fresh as his ingenue love interest. From O’Connor’s clowning “Make ’em Laugh” to Kelly’s splash-happy rendition of the title tune, there’s no finer example of the form. As the helium-voiced Hagen preens to her adoring public, “If we bring a little joy into your humdrum lives, it makes us feel as if our hard work ain’t been in vain for nothing.” You can say that again. And what better place to see it than a historic theater that opened in 1926? (7:30 p.m. Thu., Heights Theater, 3951 Central Av. NE., Columbia Heights, $5-$8, 763-788-9079 or www.heightstheater.com.)