Whiplash
Watching this film as a reference for my own film really made me appreciate it even more. Damien chazelle is so confident in his vision and it 100% pays off. With such a minimalist script you have to entirely rely on direction and acting which are both excellent.
Every single frame blatantly tells you how to feel, how they characters are feeling, what they're going to do and why they're going to do it, it's not subtle but it's so effective.
Also jk simmons is just incredible