Mine is Lost Highway. It’s one of the most amazing pieces of media I’ve ever experienced. It’s dark, surreal, and I still don’t know what it’s about for sure. I have my own interpretation, as do many others. Who’s right? We’ll never know. The film is a fucking trip. I highly recommend.
Boondock Saints for me. Watched it obsessively for a solid semester in college, and it helped shape my views on capital punishment, especially with the “person on the street” interviews at the end