I'm probably not unique--at least for my generation--to have been introduced to the work of Philip K. Dick through the films his work inspired. I remember being mesmerized by Blade Runner in the late-1980s--I watched it on VHS. I enjoyed it enough to seek Dick's work, both his short stories and novels, out to read. I have spent hours between on the pages of the worlds he created. I've also enjoyed many of the films made from his work, especially the recent release of A Scanner Darkly, the aforementioned Blade Runner, Impostor, and Screamers.
A Scanner Darkly