Jason Craig's shaggy celebration of storytelling as a life force, featuring a mountainous mythomaniac of a mother played by Jessica Jelliffe, suggests a marriage of Samuel Beckett and Baron Munchausen. Directed by Ellie Heyman, and featuring Mr. Craig and Peter Blomquist, "Longyarn" creates an exuberant American variation on Beckett's tragicomedies that even has room for optimism (1:15).