Based on no science whatsoever.
I think @protist was close with the Night of the Lepus suggestion, but I think a different movie about a bunch of rabbits may actually be more thematically fitting.
Watership Down
A small group of people/rabbits breaking off from a very large group. Forewarning bad things happening in the larger group that they are fleeing. Attempting to invite others to join them along the way to increase their numbers to a sustainable level. Conflict with another group of domineering authoritarians.
It’s all there.
Dumb and Dumber
Oh, my god. Beans everywhere. There is beans everywhere! Dammit! There’s beans on the front page. Oh, my god! This site is full of BEANS!
I thought Pushing Tin was the aircraft controllers movie.
It’s about Air Traffic Control, but I never heard it quoted to the degree that Airplane! was. Although that “Gimme a plane, I’ve got a hole” line got a lot of play. Die Hard 2 was quoted some too, “Rack 'em, stack 'em, and pack 'em!”. But Airplane!?
I know people who speak jive.
Is there a movie about Marxist nerds yelling at libs? I’d watch it if so
I’m not sure, but probably not “Red Dawn”
Lemmings
Is there a film called Lemmings? Seems a safe bet there is one.
Four Lions
Another option:
(Yes, this is Ann Margaret in a pool of baked beans, about to get hit with chocolate syrup)
Ann Margaret. Yow!
Removed by mod
This movie.
The Last Days of Disco.
Underdog
Hundreds of Beavers (2022). Dunno why. It just feels right.
