The Fountain
Director Darren Aronofksy has refused to give viewers the answer to his confusing ending. He said, “It’s a film that’s a journey and it’s a trip and it’s an experience throughout the meditation of a lot of these questions.” Basically, if you don't get it, look deeper!
Solaris
This film follows the character Kris Kelvin as he is on a spaceship that's orbiting a sentient planet. Somehow, the planet is able to tap into his memories and create false realities. At the end of the film, Kris reunites with his father and everything is "perfect." According to the director, he's actually still on Solaris and chose to be in a false reality instead of the harsh, real one.