Dead Ringers
Dead Ringers is perhaps Cronenberg's most disturbing and beautiful film to date. It challenges what people have come to expect from the "master of body horror," focusing on the horror within rather than someone's insides spilling out (well, maybe metaphorically in this case). It's also an interesting commentary on destructive male behavior and internalized misogyny. It left me with lots to digest, definitely one of the best "feel bad" movies of the 80s.
Oh, and this is quite possibly Howard Shore's best collaboration with Cronenberg.