Oh, I have never ever annoyed a teacher at school. Fellow students who think they were cool were another matter... I almost got expelled for punching a boy who annoyed me constantly and pushed me around... he was the nephew of the principal though... And I cannot count the times I punched other boys who thought annoying girls was ok because "they were weaker"... So nop, I wouldn't be avoid of punching Ginny AND Harry (for interfering) if they annoyed me too much and ruining my homework is TOO MUCH.