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.
Back to the Future. It’s both an amazing time capsule of the era and somehow also timeless. All the actors absolutely nail it and it’s just super fun to watch. I never get tired of it.