LET'S SCARE JESSICA TO DEATH (1971)
Directed by John
Hancock
Starring Zohra Lampert and Barton Heyman
Jessica (Lampert), who has just been released from a mental institution, begins to think everyone around her is a vampire. Her friends think she's just going crazy again.
This is a nearly classic early 1970s horror film, with gritty photography, a documentary feel and some gruesome (for the time) gore effects at the end. Like "Rosemary's Baby," you're never sure whether Jessica is really onto something sinister, or whether she's just going insane. The spookiness is often subtle: Her musician husband drives a hearse, while she decorates their new home with tracings she made from a local cemetery.
It's an injustice that this film is out of print because it's infinitely superior to a lot of the crap being produced today. You might find it on an auction site or at an old video store.