I think more stabbing would start to look like gratuitous violence for the sake of it, rather than a necessary form of artistic expression underpinning the transitory, existential dimension of contemporary life.
Having thought a little more about this, the girl (working name 'Victim 7') will pull back the duvet, remove her T-shirt to reveal an ample 32HH bosom sculpted senuously in the breaking morning light, while her male companion checks the Twitter feed on his mobile phone. He notices a chillingly-named new follower. She looks up suddenly towards the door, her eyes widening in horror. A shadow slowly falls over them as someone approaches.
Can't say any more, don't want to ruin it for anyone. But their day goes downhill from there.
He should stab them while they have sex, and the girl should think he is moaning with pleasure and squirting hot fluid all over her and shes like mmmmm yeah, but when she looks around hes getting stabbed.
Then the girl tries to run and he stabs her in the naked ass, then in the boobies, and shes screaming my ass and boobies, and all them men watching are vomiting with disgust, cause she had such perfect boobies and ass.
Then when they are dead he takes their bodies and dresses them as scarecrows and puts them in fields, and the film will be called scarecrow.
The cover poster will show a crow.