I'm not sure 10 To Midnight qualifies as a slasher or horror film. But I definitely consider it to be pure awesomeness. Between the gonzo craziness of the naked killer chase scenes. "Pedro's" hilarious obscene phone calls, and the greatest climax to an interrogation scene ever filmed it gets my vote. Like Death Wish 3 it's one of my absolute favorite bad day movies. If you haven't seen it you really need to check it out.
Bronson played opposite Vincent Price again in the non-horror Jules Verne adventure/fantasy MASTER OF THE WORLD. That TWILIGHT ZONE was a good one, nice work by Bronson and Montgomery !
10 To Midnight, followed by Texas Chainsaw Massacre 2 for me. 10 To Midnight definitely needs a Blu-ray release along with other Charles Bronson/Cannon films. If not Shout Factory, maybe Arrow?
I've only watched 10 to Midnight and Lifeforce from the list. 10 to Midnight easily wins for me... quite American Nightmare-ish in terms of sleeze/thriller/slasher (towards the end) all rolled in one. For a Bronson flick the ending took me by surprise.
Oh man. After seeing how many people voted for Lifeforce, I feel embarrassed that I voted for Hospital Massacre lol. I dig Lifeforce, but I had more fun with HM. Go figure.