Its probably a common answer, but "Measure of a Man" from Star Trek: The Next Generation. It makes me hope for a future like that, where people can settle their problems by talking it out and debating, and even change their minds. Whenever I think about what Star Trek is really about, I think about Measure of a Man. Its such a shame Paramount's Picard show disrespected it so badly.
Vampires, The Masquerade: Bloodlines. The whole vibe of the setting, the story, the locations, and then when I finally understood what the plot was really about. Masterpiece of a game, couldnt stop thinking about it.