[Xantar]

Well, this has turned out to pretty much kill my theory, but I'll offer it to you guys anyway.

My theory was that people in their late 20s (especially married ones) would find the beginning of Up more moving whereas younger (and unmarried) people would cry more at the end of Toy Story 3.

Although I liked both films, I was moved more by Toy Story 3 because it was more relatable to me (although I packed up for college 10 years ago). I also think that the end of Toy Story 3 was really a lot sadder than anything that happened in Up. If you think about it, the first few minutes of Up is really a pretty happy story. Carl meets the love of his life, they marry, they stay married to each other until death do them part, and as far as we know, they never stopped loving each other the entire time. Sure, they never had children, but other than that they really had it good.

The ending of Toy Story 3, on the other hand, is the end.

But your mileage may vary.