What movie had the biggest impact on you?

Koyaanisqatsi which means something like Life Out of Balance, a Hopi word. It's a music movie, with no story or dialogue, just hypnotic music by Philip Glass and exquisite cinematography by Ron Fricke who went on to make Baraka and Samsara which are visually striking too. I saw Koyaanisqatsi soon after I stopped working, and I was facing the world anew like a stranger outside it all, the film was like from that outsider POV that I saw myself having from then on.