3. A.I. Artificial Intelligence (2001)
Unlike other movies on this list, this one does not have a dark setting or grim cinematography, and that's part of what makes it so unsettling. While it looks very much like a typical Spielberg movie, there is an unrelenting sadness that runs through the whole film: it's set in the future where androids are common, and the android manufactures decide to create a new model that looks and acts like a little boy. After a tragic accident puts their son in a coma, a married couple adopt the boy android named David (Haley Joel Osment,) but problems arise when the son wakes up. Despite clear instructions to have David brought back to the android lab, his mother sets him free, so he can miss and love her for millenniums. This movie has so many sad and dark themes that it's hard to know where to start. David is unsettling to begin with: he looks like a young boy, but there is something off about him you know he isn't a real boy, although he desperately wants to be. If he was real, then his mother would love him, but she ultimately rejects him and sends him away and onto a perpetual search for the Blue Fairy. that leads him to horrific scenes and miserable discoveries. And then there's the ending, which is so depressing that it makes the rest of the movie retrospectively even more bleak.