The first full length animated movie you've seen

[Nebuchadnezzar]

What's crazy is that no one has mentioned The Lion King which is Disneys biggest and most loved movie.

I find that rather fascinating

EDIT: I thought The Lion King was good and had some good Adult one liners like

Zimba: "you're so weird"
Scar: "You have no idea"

But it was nothing compared to Beauty and The Beast in my opinion.