You, Percy and Oliver were all in the library, studying for your O.W.L.S, however Oliver was stressed over techniques since he was the Gryffindor quidditch captain and Percy was frustrated because he was a Gryffindor prefect and Gryffindor were losing house points

Percy: I just don't get why they won't listen to me, I'm a prefect for Merlin's sake

Oliver: you think you have it bad? That Marcus Flint (the Slytherin quidditch captain) keeps getting on my nerves, always playing dirty