I got the scar in the dumbest way, too. My best friend and I had a friendly competition for most points scored. She won. So I bowed to one knee to honor the victor. When I did, though, I crossed the axe under my arm and SLICE! Cut right in the forearm. It was just a scratch, no worse than a deep cat scratch, but I can still say I got a scar from axe throwing.
As to the question, hmmm. The first two are easy.
Black & white movie: Out of the Past (1947)
80s: Back to the Future
The third one, I'm not sure. Cloud Atlas, perhaps. It's incredibly divisive. People either love it or hate. And while I recognize it's problematic, I love it.