The Marc Pease Experience (2009)

Genre: Comedy
Starring: Anna Kendrick, Ben Stiller, Jason Schwartzman, and Gabrielle Dennis

Plot : This comedy tells the story of Marc Pease, a grown man living life vicariously through recollections of youthful glory. Ten years out of high school, he's a man still living in the past, when he starred in his high school's musicals. Over the course of one day, events come to a head. While watching from the sidelines as his former teacher/mentor Mr. Gribble oversees the opening night of another show, Pease has an epiphany. Through a cathartic, hilarious process, he finally exorcises his demons and realizes there's more to life than the roar of the greasepaint and smell of the crowd that is Broadway

http://www.imdb.com/title/tt0913413/
http://en.wikipedia.org/wiki/The_Marc_Pease_Experience