The current climate of cinematic comedy is comparable, to an extent, to the trend in horror: everything is geared toward pull-out-all-stops excess that is more disgusting than entertaining. We should thank our lucky stars for Christopher Guest, a consistently surprising filmmaker (he directed "Best in Show" and wrote "This is Spinal Tap") who makes 'mockumentaries' that play like actual documentaries. "Waiting for Guffman" follows Corky St. Clair (Guest), a flamboyant stage director who gathers a group of 'eclectic' locals (a cross-eyed dentist; a husband-and-wife travel agent team; a Dairy Queen employee) for a production about the sleepy town in which they live (its claim to fame being home of the footstool). There is a hilarious authenticity to the behind-the-scenes footage, but the film never laughs at its subjects--as viewers, we share Corky's (admittedly delusional) passion with bittersweet good humor. The supporting cast--consisting of Guest regulars Eugene Levy, Catherine O'Hara, Parker Posey, Fred Willard, Bob Balaban, and Larry Miller--is in top form here. "Waiting for Guffman" is a quiet comedy gem about a dull, quiet town. And it's also ridiculously rated "R" for two quick instances of F-word usage (way to call it, MPAA!).