Eccentric Jeffrey Mannus (Jon Heder) is 29 years old and lives with his mom, Jan (Diane Keaton). He sees no reason to alter this arrangement, but his perfect world is upended when Jan meets Mert Rosenbloom (Jeff Daniels), a motivational speaker. Mert successfully woos Jan and moves in on Jeffrey's territory, something Jeffrey will not tolerate. Jeffrey enlists the aid of an unlikely ally, an aspiring singer-songwriter, Nora Flannagan (Anna Faris), with an anti-establishment penchant and a soft spot for him. As the war between Mert and Jeffrey escalates, something unprecedented happens — slowly, to both his own surprise and horror, Jeffrey discovers his inner adult.

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