Driller Killer

from Wikipedia:

Driller Killer was a low budget independent feature, with a cast of unknown actors, produced by Abel Ferrara's own Navaron Films company 1977-78. It was filmed on 16mm film and utilised Ferrara's Union Square apartment and adjacent streets as locations. It features many of the elements which became trademarks of Ferrara's later films. These include Catholic iconography, gritty urban locations filmed at night, an eclectic soundtrack combining punk rock and Bach, scenes of extreme violence and a religious theme of redemption, salvation and damnation. The punk rock band in the movie reflects contemporary New York punk bands such as the New York Dolls and Television.

I really really like this movie. It's more like an early Paul Morrisey film than a slasher. The apocalyptic 70's Punk Rock New York vibe is fantastic, and I get chills just thinking about the ending.

It's public domain, so you can get it anywhere on DVD for a dollar or two. Or you can click the above image to view or download the whole uncut feature.