A bully discovers his sense of humor when his targets make nonsense words and phrases out of his taunts. Then they all have a laugh and decide to be friends. Two things: 1. Laughing at a bully rarely makes him see the error of his ways. 2. I didn't think the silly nonsense talk was very funny, and it's always discouraging when characters are said to laugh heartily over something you don't think is funny.
Still, it was generally reviewed well, so maybe I just don't get it.