Forbidden Planet
War of the Worlds (the 1953 version)
The Day the Earth Stood Still (when someone told me it was an allegory for the story of Jesus, it all made sense).
Mars Attacks (Just for the campy humor)
Earth vs. The Flying Saucers (same, but it wasn't intended that way)
And finally, perhaps the best, This Island Earth.
Would you buy a used Interocitor from this man?
Any list without Forbidden Planet is useless.
The Day the Earth Stood Still. Forbidden Planet.
Yep and yep.