Specifically, the Dr. Phibes Double Feature The Abominable Dr. Phibes/Dr. Phibes Rises Again. It came up on Twitter, and the first one at least is ridiculously good; Vincent Price at his best and silliest. Or maybe the movie is ridiculous, and good. I’ve never actually seen the second one, but I hear that it likewise rewards the indulgent viewer.
Note: some awful person put THE ABOMINABLE DR. PHIBES on YouTube. At 1080p HD resolution, too. I condemn such a flagrant violation of copyright, of course. And have embedded it so that you might condemn it, too.