The title stands for “adult children of divorce”—one of whom (Adam Scott) is forced to contend anew with his long-and-bitterly divorced parents (Richard Jenkins, Catherine O'Hara) during the run-up to his brother's wedding. The script by Ben Karlin and first-time director Stu Zicherman is a highly polished comic gem—perceptive, often excruciatingly funny and with a ring of sardonic truth. Zicherman directs with a breezy assurance that belies his rookie status, and the movie has all the earmarks of indie filmmaking at its best. There's also a top-drawer supporting cast (Jane Lynch, Amy Poehler, Clark Duke, Mary Elizabeth Winstead, Jessica Alba, Ken Howard), all of whom seem to have piled aboard for the sheer fun of being part of the show. The ending, upbeat yet ambiguous, is a particularly nice touch.