The Jar (1984) 
Despite the thread-bare script and emotionally void 'acting' there was something slightly intoxicating about the highly unimaginatively titled 'The Jar'.
The plot is a simple one: Man picks up someone after an accident and takes him back to his apartment to get cleaned up; man disappears; giant jar dwelling demon remains; demon gradually starts possessing man; the end (pretty much).
However, despite the glaringly obvious short-comings, the possession based events which run throughout The Jar's fairly short running time is where the film really came into its own for me. These events are played out as dream-like sequences involving some nice use of camera effects, lighting and sound almost imbibing an Argento-ish quality at times - although this is where the Argento comparison ends (unless we're talking Dracula 3D or Giallo Argento of course...). Although I am being slightly unfair, as I'd rather re-watch The Jar over the aforementioned Argento pairing any day.
Originally posted here:
Nightmare USA Films Discussion Thread