Lol there are tons of weird ones. Coral reefs are cniderians in a polyp form, which are closely related to jellyfish—also cniderians. That type of animal has two life phases (I think, maybe a couple more). As youngsters they’re a polyp, and usually attached to something, then when they’re mature they take on a Medusa form which is the visual you get when you think of a jelly fish. Corals just uniquely live out their whole lives as a polyp.

That explains the scene in The Emperor’s New Groove