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

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

District 9

Napoleon dynamite pretty much sums it up. I intensely dislike the film but it's pretty indicative of the human condition.

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

The Invention of Lying

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.

Full Metal Jacket.

Hellraiser II

shrek 2

gremlins 2

Samsara

Earth Girls Are Easy

Wall-E. Sums it up pretty well

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

Superbabies: Baby Geniuses 2 (2004)

Half Baked

“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

Shawshank Redemption

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

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

Salò.

I mean best is USSR's 1965 Triumph Over Violence, directed by Romm

Magnolia

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

Rocco's Animal Trainer #3.

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

Samsara

Schindler's list. Yeah aliens. It's like that. Go ahead and end us thx.

A youtube compliation of high tension powerlines exploding.