Invader Zim - Dark Harvest
When a pigeon lands on Zim's head in class, he is sent to the nurse's office for having 'head pigeons,' but he becomes concerned that the nurse may discover that he is not actually human. To avoid this, Zim steals human organs from other children and replaces them with other objects and ingests them himself, resulting in him having multiple hearts and spleens. When Dib notices Zim had been out of class for a long time, he discovers Zim and what he had been doing and tries to stop him. In the end, Zim passes his examination, and after it is discovered that Zim had swapped a mooing can toy into Dib's body, he is immediately dubbed inhuman by the nurse, and is dubbed a "hideous mooing cyborg boy" in a resulting newspaper article.