Alright listen up guys, this is indeed the UK poster, I was directed to this site by the filmmaker.
But please believe me when I say that it has nothing to do with the movie... for the most part.
In all actuality, those people are not in the movie. If you've seen the trailer you'd understand what I'd mean. Otherwise, I understand your trepidation about it. It's more of an ironic statement than anything.
I will explain it, but I'll have to give some spoilers to do it, so beware
SPOILERS
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When the movie starts out you see a very glossy looking picture, a voiceover explains that a maniac escaped from a mental institution, and then we see a big breasted waitress getting stalked after hours at the diner she works at. This lasts for all of 2 minutes, and just as the killer pops up to kill her the picture cuts out.
We are now looking at Max Parry, and it soon becomes apparent that he has rented this shitty teen slasher from the video store and taped over it. What he tapes over it of course is his own bloody murder spree. I could go on but it would ruin some of the other plot twists. So basically, the opening (and the poster) are kind of like an ironic bait and hook for the audience.
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Anyways, I think this is a great gimmick within the film but again, without knowing anything about the film this UK poster is definitely a stupid idea. It's funny in retrospect if you've seen the movie, but if you haven't you'd have the reaction that all of you just did.
So, you can either read the spoilers to feel better, or just take my word for it.