Shivers (a.k.a. They Came From Within, 1965)

Director: David Cronenberg

Cronenberg once aptly said, "Sex and violence go very well together, like bacon and eggs." So it should come as no shock that Shivers, one of Cronenberg's first horror films, is filled with plenty of both. The subtly terrifying, vintage horror vibe of the trailer serves as an indication of what's to come: a phallic shaped, worm-like virus that slowly attacks the residents of a luxe apartment building. The virus literally inhabits its victims as if it's a snail that has found a new shell, forcing its victims into a uncontrollable, rabid sex frenzy.

The virus can only be spread sexually, so an orgy seems imminent from scene one—could there be a more efficient way to spread a virus? Cronenberg's pièce de résistance is the film's culmination, which shows the last uninfected man pursued by a sex-hungry mob into a pool. The man is swallowed by the mostly-naked mob in slow motion, whose first contact with the virus is made by way of a wet kiss from a beautiful brunette. What a glorious way to go out.