Saw a brilliant Aussie horror called 'The Loved Ones' yesterday. I usually avoid the torture stuff, but I took a chance on this, based on its reviews (and the fact that it was on telly, so no effort/money required)
Basically, the premise could have been the springboard for a crap, cliched movie, but rose fantastically above that. A high-school kid is asked to the prom by a girl, refuses her and is kidnapped and tortured by her.
The story was told with sparse dialogue and such well-rounded plotting. I thought at first there was one mis-step, but no: the character whom I could only presume was there simply for dubious 'sex-and-comedy relief' came out with one line of five words towards the end that explained her character beautifully.
The acting was excellent and the whole thing tied together so well.