The fact that they reference the fact that banban doesn't see himself as one of the creatures, but as one of the crew. Edit: I decided to add an explanation for what happened. The kids are watching an ad (most likely) on how they help kids make sure their organs and stuff were all healthy. The girl, who really liked it, goes up to a scientist (banban) and tells him what she thought about it. As a normal person would do, he rewards her for noticing stuff that other kids didn't and the other kids were also happy to be at the kindergarten (or possibly to be done with the video lol.) The scientist ran a few experiments with no human donors so they all ended up bad. But when he realized that gv/givanium could actually work as a source of blood, he took his own sample and a gv sample. He went up to an old banban body and injected the blood and gv. Banban now has his blood which means he thinks like the scientist. The first initial reaction of the scientist is something has gone wrong and he needs to kill the experiment. He fails when banban opens the elevator (trapdoor?) And pushes him down there. Banban still thinks like the scientist so he thinks he IS the scientist. (Thank you for your time!)