Oh, c'mon, he didnt do that on purpose - I saw Zabini ask him a question just as the pot of jam was being passed. And that joke he told about the rabbit and the djini was really funny, did you hear it?

Moon, on the other hand, was acting very oddly. Hes not like that in the common room, normally, so I dont know what he was thinking. Maybe he was out of sorts?

And I think it must happen round 6th year, that change. Look at the difference between Pennifold and that prefect of yours, Weasley's brother.