Behind the Mask: The Rise of Leslie Vernon (2006)
Dir: Steve Glosserman
Writ: Steve Glosserman and David J. Stieve

Behind the Mask is a definite genre film. Leslie, a career serial killer, agrees to let a group of film makers document his mission to fulfill the legendary horror film formula and thus follow in the footsteps of his heroes Michael Myers, Freddy Kruger and Jason Vooerhees. The plot contains two parallel paths: the first is that of a classic horror film (bunch of partying teenagers stalked by a masked superhuman killer), and the second is genre-play. The two take turns in propelling the action, and are woven together well enough that the layering is not superficial: the classic trope of knowing what's going to happen before the character onscreen figures it out with agonising slowness is given a clever twist as the film goes on (watch it and you'll see). Not particularly scary, but certainly very interesting and fun. Makes you reminisce about your favourite classics, and not in a bad way.