So, this movie(not cartoon), the only thing I can remember is this: a boy and a girl(possibly siblings) are stuck in some far away land. This scene is that they are watching some kind of ceremony, where the women are sliding down a slide. When they come up they have butterfly wings. When the guys go down the slide, they become strong. That is all, please help me remember!

Probably The Great Land of Small (http://www.canuxploitation.com/review/greatland.html).

Oh thank you!