I don't know how, but Pixar has nailed the formula of a family-friendly movie that kids adore, adults will happily sit through, and is a perfect mix of uplifting and devastating, each in their own way. My personal favorite is Ratatouille, which I think might be the best animated movie (or maybe just movie) of all time. It's genuinely funny, sweet, and transports you to the romance of Paris.
It also holds incredible nostalgia, since I watched it when I was a kid. Pixar knows how to tap into that feeling, so kids from many generations will grow up with fond memories of the wholesome, quality movies from their childhood. They all have incredible rewatch value, which makes for a sustained fandom, a fandom that's exemplified in these memes. They prove that the movies of our childhood still hold incredible weight for us now. So take a scroll and pay homage to your old friends.