There are two kinds of spoof movies. The first is the self-aware kind; it knows it’s a parody and tries its hardest to make you crack up with in-jokes, double entendres, and visual puns. Some examples of this type are “Airplane!” and “Blazing Saddles.” Then there’s the kind of spoof that thinks it’s a real movie and tries to take itself seriously, but ends up being amusing. Movies like this include “The Player,” “This is Spinal Tap,” and the new film, “Waiting for Guffman.””Waiting for Guffman” is a fake documentary about the town of Blaine, Missouri, the “Stool Capital of the World” (and that’s the kind of stool you sit on). The town is celebrating its 150th anniversary, and is putting on a musical. Christopher Guest stars as Corky St. Clair, the director of the play. Corky is flamboyant and buys pantyhose for his “wife” who is always out of town, yet no one realizes that he is gay. He and his motley crew of players (a cross-eyed dentist, a travel agent who’s never left Blaine, a perennial Dairy Queen employee) do their best to create a great musical about the history of Blaine, but it never gets above tolerable. In fact, it’s mostly horrible. The townspeople don’t notice, though. They think it’s the greatest thing they’ve ever seen.Most of the laughs in this movie don’t come from one-liners or jokes. They come at the ends of scenes, after you’ve just heard an actor talking seriously about taking the musical to Broadway, or about how Blaine was being probed by aliens long before anyone had heard of Roswell. What you’re watching seems realistic, but when the scene is over, you realize how ludicrous the words spoken were, and it’s hilarious. Of course, there are scenes that are funny in themselves. For example, the musical is a riot, simply in the sheer awfulness of it. And seeing the effeminate Corky acting as the girl-chasing studmuffin is worth the price of admission alone.”Waiting for Guffman” was written by the same team who wrote “Spinal Tap,” but this movie is far more funny. If you thought the volume dials that went up to 11 were great, wait until you see Corky’s “The Remains of the Day” lunch boxes.