Baghead (2008)

101 Films

A wildly funny send-up of low-budget horror movies from the award-winning Duplass Brothers, released on Blu-ray for the first time in the UK.

While debating the merits of writing a screenplay based on a bag-headed serial killer, four friends soon discover there may be more to their story than meets the eye when a stolen car battery, strange noises and a mysterious disappearance or two lead them to believe a sack-wearing maniac may be lurking right outside their door.

Från IMDB:
Four "actors" go to a cabin in the woods for the weekend to write a movie script. They talk about a relationship movie or a paper bag over the head movie. It starts with an anonymous baghead and slowly escalates.