Cars 2
A personal favourite of mine, and is by far the best of of the trilogy. I can't count the amount of times I've seen this movie and not been absolutely thrilled.
While being a very odd inclusion in the series, it's James bond esque story takes itself at just the right bit of seriousness, while also providing a decently meaningful personal story for Mater. I just found out on this rewatch that Micheal Caine voiced Mcmissile and it's made me love him more than ever.
I absolutely adore this movie and will continue to do so forever as it is one of the best Pixar movies of all time.