At Lupin's class, you were talking to Mattheo, Theodore, Regulus, Blaise and Draco Lupin: Ridikulus. Everyone repeats

Draco: This class is ridiculous. Mattheo: Oh please, Draco's just scared

Lupin: miss your name can you step forward? You step forward. The cabinet opens, ready to show your biggest fear, and that's when Tom Riddle step outside grinning at you

Tom: Missed me darling? he was supposed to be dead! Lupin: it's him..quick! Someone call Dumbledore!