Mama's Boy is a 2007 comedy starring Diane Keaton and Jon Heder, and features music by Mark Mothersbaugh. The film was distributed by Warner Bros. for a limited release to certain parts of the United States. Mama's Boy was directed by Tim Hamilton. Eccentric Jeffrey Mannus is 29 years old and lives with his mother, Jan . He sees no reason to alter this arrangement, but his perfect world is upended when Jan meets Mert Rosenbloom , a motivational speaker. Mert successfully woos Jan and moves in on Jeffrey's territory, something Jeffrey will not tolerate. While at a coffee shop, Jeffrey finds a... friend in one of the workers and later enlists the aid of her as his unlikely ally, an aspiring singer-songwriter, Nora Flannagan , 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. However, before this happens, Jeffrey and Mert get into a fist fight in Jan's home, causing her to break up with him. Jeffrey is pleased, but Jan kicks him out of the house.
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| Release date: | December 21, 2007 |
| Directed by: | Tim Hamilton |
| Rated: |  |
| Runtime: | 93 Minutes |
| Producer: | Steve Carr |
| Genre: | Comedy |