Obviously the greatest documentary ever committed to film: The Adventures of Buckaroo Banzai Across the 8th Dimension.

District 9

I just came here to upvote every "Idiocracy" comment

Double Feature: Ender's Game (2013) and Starship Troopers (1997) - then we serve them a sumptuous shellfish tower to discuss their surrender over dinner.

Letting them know what mankind is all about seems like a terrible idea. We're jerks.

If I could get away with a miniseries, James Burke's Connections.

Or Cunk on Earth. It's a toss-up.

Hellraiser II

The Day the Earth Stood Still (1951) - Literally telling aliens that we will fuck shit up.

Stalker (1979) - You can leave your garbage and we'll think it's treasure.

Dude, Where's My Car? (2000) - Humanity is really just a bunch of idiots, stumbling through everything.

Wall-E. Sums it up pretty well

Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb.

Shawshank Redemption

Earth Girls Are Easy

Half Baked

Fellowship, two towers, return of the king. Tell them it's one movie showing how the littlest person can make the biggest difference.

“The Final Member”

It’s a documentary about the worlds first penis museum in Iceland trying to finally secure a human specimen

https://youtu.be/sZMaheZ_Iy0?si=SCIxh2weymwp3AOk

Requiem for a dream

Fun fact: I have watched none of the movies listed here in the comments

Rocco's Animal Trainer #3.

Magnolia

Samsara

Cloud Atlas

Charlie Chaplin Modern Times

They Shall Not Grow Old (2018) by Peter Jackson.

End of ze world.

Either point break or bad boys 2.

Nobody has mentioned porn. We try and say things in our great works of art but maybe they'd learn more from what we make when we're trying to say nothing at all.