Hell or High Water is an incredible movie.
My pretentious contribution to the list: R
ussian Ark Toy Story and Into the Spiderverse both seemed to me to mark hugely ambitious changes in animation styles.
Lord of The Rings for the SFX and crowd / army scenes
Blair Witch Project for starting the whole found footage format craze
Trainspotting - I was 16 when that came out and, correctly or otherwise, the content and gonzo style felt revolutionary for such a "big" movie
Once Were Warriors
Beasts of the Southern Wild - just stuck with me - the closest cinematic equivalent to "magical realism" in novels that I've seen
"Are you sure we're going fast enough?" - Emil Zatopek