I love hearing about obscure or forgotten films that people are passionate about. I was in a thread on Reddit, IIRC, and someone mentioned The Man From Earth. I just watched it for the first time and I can see its appeal.

I'm sure you have more than one. For me, a couple of favorites off the top of my head are Wristcutters: A Love Story and Wings of Desire. And some old timey classics that I rarely hear mentioned anymore are I Know Where I'm Going and The Lady Eve.