In the scene which Harry, Hermione and Ron are doing a project for professor Snape in a classroom (or whatever) sometime Fred or George (can't tell who is who) asks a girl to go to the dance with him. Then Ron asks Hermione to go to the dance with him, but suddenly Snape comes from behind hitting Ron AND Harry with a book and Harry smiles and tries not to start laughing... He likes being hit?... don't know.