I’d have to say Finding Nemo, Cars and Up for me. Finding Nemo made me cry when I first watched it when Nigel was telling Nemo and the Tank Gang of Marlin’s daring exploits. The way how Nemo’s father has become a legend in the lengths he will go to reunite with his son just squished my heart in two. Cars, the first Pixar film I truly loved, made me cry when Lightning pushed The King across the finish line. It’s incredibly cliched, and I suppose now, with the benefit of hindsight, I coulda seen that ending from a mile away, but goshdarnit that was a beautiful denouement of Lightning’s transformation. And, of course, I heard a few sniffles in the theatre during Up’s opening montage. I teared, didn’t cry, but Up consistently had the most emotional moments among all the Pixar films for me (watching Dug’s “I was under the porch because I love you” just killed me).
Toy Story 3’s ending, as I’ve said before, was a huge backfire for me because of a few inconsiderate audience members that ruined the mood by laughing and Andy’s little gasp at the end (which I, too, felt was overdone). The incinerator scene didn’t make me cry, but I was (almost literally) on the edge of my seat.
Wall-E had its moments, the cinema was deathly silent when Eve fixed Wall-E and he lost his memory for awhile. I was more of like “No, please don’t let this happen” than crying or anything. Define Dancing remains one of my favourite, if not the favourite Pixar scene of all-time for its beauty and wonder.
And as much as I criticise Brave (and have yet to muster the energy to write it a proper review), the ending where Merida tells her (bear) mum that she loves her and the (transformed back to a human) mum replies in kind made me all misty-eyed.
EDIT: If you think about it, this thread’s title is quite subjective. At face value, it can mean a heartbreaking or tear-inducing scene. But “emotional” can also mean exhilarating, or frightful, or anything that invokes strong feelings.
So for excitement, I’d go with both Cars movies. For fear, I’d say Toy Story 2 for the “I don’t like you anymore” Andy nightmare scene ALONE, which made me cry as a kid (no, those weren’t tears of joy or sadness, but pure, unbridled terror).