*Spoilerific if you haven't seen A.I.*
Yeah. Though I didn't cry myself, I just couldn't get the damn movie out of my mind for 2 weeks. It depressed the hell out of me. Humanity dead, thousands years have pass, it just searching for remnants of their creator. It's only one day and the advance mecha warned David, they gave him his "blue fairy" and mother to bring closure to this journey. It was just a haunting ending.
You see this fleeting happiness, but realize it's all just ending. I felt so hallow when it ended. I ended up warning my sister, some will see it as some type of "happy ending", which I feel would be the luckier ones as you can easily just toss it aside of that is that, or like me, just totally heartbroken by the end; it was the later for her.