Severus Snape: I told Dumbledore you were helping an old friend into the castle. And now, here's the proof.
Sirius Black: Brilliant, Snape. You've put your keen mind to the task and come to the wrong conclusion. Now, if you'll excuse us, Remus and I have some unfinished business to attend to.
(Snape puts his wand at Sirius' throat...)
Severus Snape: Give me a reason. I beg you!
Remus Lupin: Severus, don't be a fool.
Sirius Black: He can't help it. It's habit by now.
Remus Lupin: Be quiet.
Sirius Black: Be quiet yourself, Remus!
Severus Snape: You two, quarrelling like an old married couple.
