The opening credit sequence artfully mimics the reassuring tone of Disney does Rodgers and Hammerstein and introduces the diminutive heroes, third-graders Stan, Cartman, Kenny and Kyle. Their first port of call, however, is a movie house, where they bribe a bum to walk them into the R-rated comedy 'Asses of Fire', starring the scatological Canadian clowns Terrance and Philip. The boys emerge with a new vocabulary they can't wait to show off, and pressing questions about the nature of the clitoris. The first half hour aims low and rarely misses. A below-the-(Bible-)belt satiric assault on the pieties of the censorship brigade, this feature spinoff from the animated TV series takes no prisoners, and blows gratuitous raspberries at the Baldwin brothers, Saddam Hussein and Winona Ryder among others. Genuinely outrageous and sometimes hilarious - but size does eventually matter, and all-rounder Trey Parker just can't keep it up for the full 81 minutes.