Atlantis: The Lost Empire is such an underrated Disney movie, and I think the moment where after Milo found out Rourke used him to steal the Atlantis power source, he chews out Audrey and the others for going along with it with this awesome speech:
"So... I guess this is how it ends, huh? Fine, you win. You're wiping out an entire civilization, but hey... [Coldly] you'll be rich. [To Audrey] Congratulations, Audrey, looks like you and your dad can probably start that second garage after all. [To Vinny] And Vinny, you can to start a whole chain of flower shops. I'm sure your family's gonna be very proud. [To everyone else] But that's what it's all about, right? [Angrily] Money."
And because they all have consciences, they all turn on Rourke and join Milo. Audrey in particular wins the moment by saying the one thing I wish certain other people today would stand up and say:
"This is wrong, and you know it."