#49 The Rocky Horror Picture Show (1975)
A newly-engaged couple has a breakdown in an isolated area and must seek shelter at the bizarre residence of Dr. Frank-n-Furter.
You can read more about the movie here.
#50 The Day the Earth Stood Still (1951)
When a UFO lands in Washington, D.C., bearing a message for Earth’s leaders, all of humanity stands still. Klaatu (Michael Rennie) has come on behalf of alien life who have been watching Cold War-era nuclear proliferation on Earth.
You can read more about the movie here.
#51 Dr. Strangelove or How I Learned to Stop Worrying and Love the Bomb (1964)
An American Brigadier puts the world on the verge of a nuclear catastrophe, when he deploys a B-52 bomber on the Russians, without informing his superiors.
You can read more about the movie here.