It's not okay to be cruel to others.
Jenna was eating her sandwich at lunch when she noticed another sutdent didn't have anything to eat.
Jenna wants to impress her friends.
Jenna asks the kid if he wants half her sandwich because she's full.
Jenna asks the kid if he wants half her sandwich, then says he can have it if he barks like a dog.
Jenna becomes good friends with the kid who forgot his lunch.
Jenna's friends laugh, but the teacher's aide overhears and sends Jenna to detention.