"Professor Snape was forcing them to research antidotes. They took this one seriously, as he had hinted that he might be poisoning one of them before Christmas to see if their antidote worked."

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Macbeth: How does your patient, doctor? Doctor: Not so sick, my lord, as she is troubled with thick-coming fancies that keep her from rest. Macbeth: Cure her of that! Canst thou not minister to a mind diseased, pluck from the memory a rooted sorrow, raze out the written troubles of the brain, and with some sweet oblivious antidote cleanse the stuffed bosom of that perilous stuff which weighs upon her heart. Doctor: Therein the patient must minister to himself.

— William Shakespeare