This Fly Was a Human
In The Emperor’s New Groove, spoiled Incan emperor Kuzco is changed into a llama by the evil Yzma. While Kuzco as a llama can talk, other animals in the film cannot. In one scene where a disgruntled Kuzco (as llama) is trekking through the jungle with the kindly Pacha, we see a spider eat a fly. However, before the fly perishes, we hear it squeak “help me!” According to the rules of the movie, this means that the fly was also once a human.