For all its merits, This Is Spinal Tap has a lot to answer for: it spawned what could be the laziest of all current subgenres, the supposedly satiric pseudodocumentary (or, in the advertising lingo, the “mockumentary”). The title hero of this feeble entry is a school-bus driver (Billy Burke) who wins a free trip to Nashville at an Amarillo talent contest and becomes a country music star; when he accidentally injures his foot, his resulting shuffle becomes a national craze. Stand-up comic Jordan Brady wrote and directed; others in the cast include Kathy Griffin, Lauren Graham, David Koechner, and an embarrassed-looking Henry Winkler, who plays a brassy promoter and fiddles with his cigar at every opportunity.