Christopher Guest directs and stars in Waiting for Guffman (B+), an uproarious mockumentary about the denizens of a small town (Blaine, Missouri: the “stool capital of the world”) putting on a production to celebrate its 150th anniversary. Eugene Levy, Parker Posey and Catherine O’Hara are among the hilarious ensemble with each playing a singularly incompetent actor. It’s a must-see for fans of dry, small-town humor.