Anyone can mock the rituals and touchie-feelie newspeak of rehab: One AA meeting and you're armed with a year's worth of gut-busters. But this dark comedy pulls off something far harder, managing the monumentally delicate balancing act of jeering at 12-step culture's airy-fairy ridiculousness without ridiculing rehab itself. Way to go, writer Susannah Grant and director Betty Thomas! Gwen Cummings (Sandra Bullock) is an Olympic-caliber party animal; she and boyfriend Jasper (Dominic West) are ironman decathletes of drinking, drugging and dancing on tables, utterly nonplussed by waking up to find peek-a-boo holes burned into Gwen's bra. But Gwen raises the bar at her ...