Angel Heart (1987). Just resurfaced on Prime. Hadn't seen it in 30 years, but remembered it being interesting, different, spooky and erotic. And it was still all of the above after a rewatch. Mickey Roarke still had promise as an up-and-comer, DeNiro had another two decades before becoming a punchline, and of course, this was the role that got Lisa Bonet fired from The Cosby Show for her sex scenes. Alan Parker directed and did so rather exuberantly. Even knowing the outcome, a rewatch allowed me to see more of the details and clues dropped along the way that pointed to the obvious conclusion. Roarke and Bonet were excellent, bit parts by Charlotte Rampling and bluesman Brownie McGhee were compelling, and even DeNiro's over the top demon (which supposedly was an ode to Martin Scorcese) held interest and fit the proceedings well.
It was controversial when it came out, with Bonet and all the blood and the voodoo stuff, and it became a cult film. But it's held up very well IMHO and is worth a watch, especially if you hadn't seen it before, but even if you have.