Whether or not you like director Mark Waters’s debut will depend largely on your appreciation for over-the-top acting and fashionable decadence. Set in a suburban luxury home near Washington, D.C., it chronicles a Thanksgiving from hell that’s more tense than the one in The Myth of Fingerprints and a lot weirder. Genevieve Bujold is magnificent as the mother, who’s blessed with sharp, theatrical lines like, “Conversation only leads to trouble,”’ but the film’s center is commanded by Parker Posey, in top form as the mentally unstable daughter obsessed by Jackie Onassis. Based on a stage play by Wendy MacLeod, the film purposely indulges a sense of arch artificiality, and its neurotic, excessive ending reaches a new low in vulgarity. Rounding out the cast are Josh Hamilton (who also appeared in Noah Baumbach’s Kicking and Screaming) as Posey’s twin brother and Tori Spelling (Beverly Hills 90210) as his girlfriend, who’s freaked out by his bizarre family.