You tried to help Sasha and Connie, two (rather hopeless) Gryffindors in your class, by giving them answers to the Potions lab before Professor Ackerman, Head of Slytherin House, caught you. After dinner, you left the Great Hall to serve your detention: cleaning all of the cauldrons in his classroom, without magic. That was two hours ago.

“You call that clean?” He deadpans as he appears behind you, looking unimpressed at the cauldron you’ve painstakingly scrubbed at for ten minutes.