The Guardian (1990) - I watched this twice in the last 10 days and I've came to the conclusion that I like it. I have to if only for it's outright bizzarness, plus Jenny Seagrove naked doesn't hurt.
*Edit* on a related note, anyone else interested is seeing Friedkin's new one Killer Joe? Looks to be pretty badass. Another colaboration with Tracy Letts, and I loved Bug.