Harry Potter and The Philosopher's Stone

"And Harry said last night," retorted Ron, "if it means we're supposed to get matey with the Slytherins, fat chance.""Well, I think it's a pity we're not trying for a bit of inter-House unity," said Hermione crossly.They had reached the foot of the marble staircase. A line of fourth-year Ravenclaws was crossing the entrance hall; they caught sight of Harry and hurried to form a tighter group, as though frightened he might attack stragglers."Yeah, we really ought to be trying to make friends with people like that," said Harry sarcastically.