Romantic comedies should never be this exhausting. Despite a few good zingers, Mars Callahan's vitriolic take on the sexes sinks under the weight of its secondhand psychobabble and smug apercus. Cuba Gooding Jr. plays a fellow who's preparing to pop the question on Valentine's Day, only to discover his sweetheart has left him. This sets the stage for a series of stereotypical characters (the womanizer, the sensitive guy, the flaming queen) mouthing the kind of bile one hears at happy hour. Shot in a week with a setup of four digital cameras, this is a technical exercise masquerading as a movie. With Matthew Lillard, Gina Gershon, Sean Astin, and Anne Heche. R, 87 min.