California rockers—Billie Joe Armstrong, John Doe, Jane Wiedlin—lend their voices to this cheerfully tasteless clay-animation parody of the Manson murders. Writer-director John Roecker has a particularly good time zinging Sharon Tate, the pregnant movie star butchered by Manson’s disciples in 1969; her proudly bourgeois counterpart, Sharon Hate, does an uproarious musical number celebrating the destruction of the ozone layer and ingests massive amounts of coke, insisting “I have to snort for two.” An exercise in free-floating mockery, the movie is ultimately more cruel than funny, though Roecker has an admirable sense of the absurd (the cult takes its inspiration to kill from a loop of the Beatles’ “I Want to Hold Your Hand”). 80 min.