ATTENTION STUDENTS
This is Professor Snape.
Your Potions Master.
If I find out who is responsible for stealing my stock of gillyweed, it will be the end of your career and quite possibly your life as a witch or wizard. You will be rendered . . . a squib. Be warned, I have my suspicions about who the culprit could be and I will apprehend you.
ADDENDUM: Miss Brontë Lupin has scored 100% on all of her assignments for my class. Adequate, Miss Lupin. Extremely adequate. Please feel free to take whatever you need from my storeroom. You know where the key is hidden.