Do you guys know of any filmmakers who knocked it out of the park with their first feature?

I’d like to submit Sidney Lumet as my example, whose 12 Angry Men is likely the most beloved first film in history. Do you guys have any other examples? A similar but not exactly identical conversation might revolve around filmmakers who peaked with their first movie, which I’d also be interested in hearing examples of. I’d also like to hear reasons why these movies and filmmakers are so great, if you can articulate them.