Sean bullies Annie in the cafeteria by making fun of her blind father and acting like he doesn't know that he's stealing her food. Annie defends herself by putting cake on his face and walks away.
In this scene, Penny bullies Sherman by calling him a dog. It's a great way to teach what bullying is and how it looks and feels to the person being bullied.
Key and Peele perform a skit that brings attention to the deeper reasons that kids bully each other. Peele bullies Key while he is reading a book and explains on a deep level why he makes each of his remarks.