Honestly, the first thing that comes to mind is J. K. Simmons's award-winning turn in
Whiplash from 2014. Probably the most intense movie I have ever seen. Simmons plays a prestigious music college bandleader (jazz), who is downright sadistic in squeezing the best out of his pupils.
Here's a representative scene, though be forewarned that it is absolutely rife with foul language and epithets...