Focus Features

Zach Galifianakis and Keir Gilchrist star in It's Kind of a Funny Story, a Focus Features release.

Keir Gilchrist (United States of Tara) stars as Craig, a stressed-out 16-year-old who checks himself into Argenon Hospital – and is relocated to the adult ward.

Zach Galifianakis (The Hangover) stars as Bobby, who becomes a mentor and a protégé to a fellow patient, Craig (Keir Gilchrist), at Argenon Hospital.

Emma Roberts (of the upcoming Scream 4) stars as Noelle, a 16-year-old patient temporarily relocated to Argenon Hospital’s adult ward.

A scene from It's Kind of a Funny Story,a Focus Features release.

Lauren Graham (Parenthood) is cast as Lynn, a wife and mother whose teenage son Craig (Keir Gilchrist) gets admitted into a hospital’s adult ward.

Jim Gaffigan (Away We Go) is cast as George, a husband and father who is surprised by the news that his son Craig (Keir Gilchrist) is staying at a hospital.

Academy Award nominee Viola Davis (Doubt) portrays Dr. Minerva, the Argenon Hospital psychiatrist tending to newly admitted teenager Craig (Keir Gilchrist).

Aasif Mandvi (The Daily Show with Jon Stewart) portrays Argenon Hospital psychiatrist Dr. Mahmoud, who has to decide whether to admit Craig (Keir Gilchrist).

(l. - r.) Keir Gilchrist and Zach Galifianakis star in It's Kind of a Funny Story

Jeremy Davies (Lost) plays Smitty, an attendant at Argenon Hospital who keeps an eye on patients in the adult ward.

Zoë Kravitz (soon to star in the X-Men: First Class movie) plays Nia, the longtime crush of Craig (Keir Gilchrist), who makes plans to visit him in the hospital.

(l. - r.) Zach Galifianakis and Keir Gilchrist star in It's Kind of a Funny Story, a Focus Features release.

Adrian Martinez (Kick-Ass) plays Johnny, a patient in Argenon Hospital’s adult ward who has his own unique style.

Ryan Fleck & Anna Boden on the set of It's Kind of a Funny Story, a Focus Features release.