Mama's Boy is a 2007 American comedy-drama film starring Diane Keaton and Jon Heder, and features music by Mark Mothersbaugh.

Eccentric Jeffrey Mannus is a 29-year-old book store clerk who still lives with his mother Jan. His father died when he was young, so he has clung to her tightly.

He sees no reason to alter this arrangement, but his perfect world is upended when Jan meets Mert Rosenbloom.

While at a coffee shop, Jeffrey finds a friend in one of the workers, aspiring singer-songwriter Nora Flannagan.

He pays him half the price he asked to do it so, when Mert comes into the shop to buy bribes to win Jeffrey over, the guy spills the beans.

Desperate, Jeffrey interrupts Nora's recording of her demo to enlist her aid to follow a lead in Arizona.

He parks it in the middle of the road and stands on the hood, holding up a radio that is playing one of Nora's favorite songs.