This is a mostly silly comedy which has some funny parts but is uneven at best. The summary is what Jeffrey says about one of his imaginary girlfriends whom he says was his 'first' in the smelly basement of the school. (Only in the deleted scenes on the DVD.)I only saw this movie because it has Anna Faris in it. I am a big fan of hers and am trying to see all her movies. In fact she is the best thing here, in a supporting role. Her character is the only fairly normal one who always is genuine and always tells the truth. Overall I would be hesitant to recommend this movie to a friend.Jon Heder ('Napoleon Dynamite') is Jeffrey Mannus , traumatized young when his dad died in an auto accident. In present time he is not 29 and still living at home. He is an amateur astronomer and mom has told him he can stay there until he makes his first 'discovery.'His mom is Diane Keaton as Jan Mannus . She has had much of a social life since her husband died and a friend is encouraging her to do something, maybe speak to the motivational speaker after a session, maybe ask him a question, maybe it will spark something.The motivational speaker is Jeff Daniels as Mert Rosenbloom . It turns out he also has a Jazz group and invites her to their Friday night jam session. Later we find out he fell in love with her the moment he first saw her.So mom and Mert start dating, Jeffrey is threatened and does everything he can to break it up. Much of it is very silly. Jeffrey's biggest problem is that he refuses to grow up, and is just an expensive slacker at the book store where he works.Anna Faris is Nora who works at a restaurant but is an aspiring singer. For some reason that makes little sense she is attracted to Jeffrey, but he is a man-boy in adult clothes.I also enjoyed Eli Wallach as family friend Seymour Warburton , and it is at his book store that Jeffrey works.

I like Diane Keaton. In fact, she's my favourite actress. But this annoying movie makes her almost unlikable. I saw Because I Said So and thought I enjoyed the movie until I watched it on Sky Movies and realised how bad it is. Then, after that I saw this rubbish. It made me want to strangle everyone in it, including Keaton. No, wait, especially Keaton. I wanted to dump her head in my horse's muck. It's got good actors and actresses in it, and they all tried their best, but nothing can ever make me like this film at all, not in a million years. Try Mad Money, The Family Stone or Something's Gotta Give if you want a good Diane Keaton movie, but don't watch this if you want to be impressed. No, really, don't watch it at all even if you like rubbish movies. Keaton even said herself the movie wasn't that good...YOU HAVE BEEN WARNED!

This movie is poorly conceived, poorly acted, and poorly written.Jon Heder is terribly annoying, and cannot escape the same Napolean Dynamite routine. Self-obsessed and ignorant.Furthermore, Diane Keaton plays the same manish, overly obsessed mother, who cares too much and yet not nearly enough about the lives of her children (see Because I Said So). Anna Faris, though i generally like her, plays a vapid idiot in this film as well.Jeff Daniels is passable but nothing special. Please, skip this film if you want to keep your soul.

Mama's Boy is a first directorial effort of Tim Hamiltion & written by Hank Nelkin. For a first effort,they get mild thumbs up from me.Jon Heder plays a spoiled insufferable 29 year old brat & nerd first class. . I do believe most of my readers know what spoiled brats of any age need. YES they need a good hard spanking, This would have been a much better comedy if any or all of the other main players spanked him.Diane Keaton looking great, plays his long widowed Mother. Jeff Daniels looking too heavy,play Dianes suitor.Anna Feris ( a newcomer to me) plays the love interest to our nerdish hero.Eli Wallach ( a spry young 91 year old) is Heder's employer & friend.The film is silly & stupid at times,BUT I did enjoy the goings on.Its really a family type film, no nudity, very little violence,no foul language.NO car crashes or explosions, just silly stupid fun.As I noted at the beginning,If I saw this in the theatre at todays inflated prices, I may felt my time was wasted,I saw this as a rental on my DVD, This probably should have been a TV movie,The running time is only 93 fast minutes.Ratings: *** (out of 4) 77 points (out of 100) IMDb 7 (out of 10)