Let's assume that you've started a movie club for aliens from outer space. Imagine that they've never seen a movie before - movies are a totally new concept to them.
The aliens can be whatever you imagine them to be - maybe they look human, maybe they don't. I'm gonna imagine that my aliens look like this:
Here are the movies that I would show the aliens that haven't seen a movie before:
Ghandi
So they can learn about a peaceful human being.
The Bikini Car Wash Company II
So they can learn that Earth girls are easy without actually seeing Earth Girls Are Easy -- that's way too advanced for aliens, who may not understand our depictions of them. Also, this would introduce them to the concept of sequels -- and, I might even get to figure out their sexuality if they're interested in seeing Bikini Car Wash Company Part 1 afterwards.
The Matrix
I would like to get their thoughts.
Christmas Vacation
Aliens need to know about holidays and most people's favorite time of year, when people have merrier spirits. They might get a laugh or two out of it, if aliens laugh. Also, when I show them Seinfeld, they'll recognize Julia Louis-Dreyfus.
What would be your movies?