In the episode where Gordo and Lizzie switch science projects, because Gordo thinks that his teacher hates him and won't give his project the grade it deserves, Gordo's brain project explodes. If you look when Gordo is talking to his teacher, after the brain has exploded, you see a piece of the brain goo on his shoulder while the camera is behind him, you see the peice, but when it pans in front of him you don't see it. And it does that three or four times.