Way back in the dying days of my PhD, an evening spent cruising the drinking dens of Leamington Spa finished up in the house of a friend-of-a-friend, with us all raptly watching the original Toy Story. I fell in love. Not, as might be expected for me, with the whole computer animation aspect, but instead with the emotional / sentimental pull the film exerted on heart-strings I never knew existed.
Several years later, my heart beat a little faster with the news that a sequel was to appear but, knowing sequels, it was a guarded tachycardial rise. Oh ye of little faith. Said heart strings were pulled once more by Toy Story 2, a follow-up that more than matches its ancestor in cleverness and its wholesome brand of sentimentality. To the degree that it's now a touchstone in film criticism (at least when I'm around) as the best example of a violation of the law of diminishing returns (though there is competition).
Toy Story 3 cements the good work of both previous generations, and completes[*] the life-cycle of the child-toy relationship. While, unsurprisingly, things get all emotional at the end (diffused pleasurably by the end-credits sequences), I was much more stretched and strained by the near-death experience faced down by Woody et al. that was immediately preceding.[**] Pixar truly know their onions if they can play an old cynic like me as if I was some finely-tuned sentimentality instrument.
[*] Technically, a sequel is not out of the question, and could pop up in the future if Pixar need a sure-fire financial hit. But it's unnecessary, and would be a mistake given that TS3 essentially closes the "circle of life" for toys. Still, one should not underestimate the power of money.
[**] Again, more excellent diffusion here, with one of the best running gags ("the claw").