I'm looking for a movie which I saw the trailer for a couple of years ago. Probably from 2009, but maybe later.
It was a science fiction / body horror movie, set in the current time. There was a creepy, driven guy who implanted some kind of device on top of, or into his head. The thing he put on his head was very striking, it looked like an elongated pyramid, or cone. He seemed to live in an abandoned warehouse, and he gathered a lot of kids around him (who he probably controled with his device). Unfortunately, I don't remember more details, because it was just a trailer. It's probably not too obscure, because it ran in a mainstream cinema before a big film (probably Moon), however I can't find it.