Hermione and Ron only briefly found it funny. But when people kept approaching Harry and both of his friends barely managed to hold a conversation with him the two became hostile. Hermione had hexed a poor girls" hair off and then proceeded to threaten her. Ron had turned a Third Years eyebrows into snakes causing him to scream for a solid minute. Harry, well Harry just amused himself with watching his friends destroy everyone else. It was quite funny seeing Hermione and Ron glare people into submission.