Flint e Scabior
Scabior: "Funny how they all thinks we wants to hear that [they were in Slytherin]. But none of them can tell us where the common room is."
Harry Potter: "It's in the dungeons. You enter through the wall. It's full of skulls and stuff and its under the lake, so the light's all green."
Scabior: "Well, well, looks like we really have caught a little Slytherin."