Let's Scare Jessica To Death is a vampire movie essentially, but a very subtle one and with a legendary creepy atmosphere. There are several specifically eerie scenes (including in a lake), but the film is also one of paranoid ambiguity. Despite that I found it just a little underwhelming, I have to recommend it as it remains streets ahead of many modern attempts at 'scary' horror movies.
Agree on Exorcist 3 and Session 9 (although, having seen the latter twice, I am still not fully grasping the revelations that are packed into the final ten minutes - perhaps this adds to its appeal).
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