.Master_of_Oldskool said:That does sound like a pretty good idea, although I'd like to point out it's been done [http://tvtropes.org/pmwiki/pmwiki.php/Film/Windigo]. Your concept clearly has a lot of significant differences from Windigo, though, so I say push onward.
Incidentally, when you mention Slenderman's "full form", what do you mean exactly?
Did I ever use the words "full form"? I'm not sure. I think it's about actually seeing him in his tall, multi-limb greatness. I want to avoid it as much as possible. To be honest, I think they should be marketed as a romantic comedy. Then put slender man in the whole movie in the background, and men in suits in random places. Then have them re-watch their wedding or other video, and start finding him there... watching them... stalking them... wait... Is he still there?