"Excellent, 10 points to Slytherin! Liquid luck is desperately tricky to make and disastrous should you get it wrong! One sip and you will find that all of your endeavour's succeed." Slughorn paused to add dramatic effect to his words before continuing on. "At least until the effects wear off. So, this is what I offer each of you today, one vial of liquid luck to the student who manages to brew an acceptable draught of living death. Let me tell you, only once has a student produced a potion sufficient enough to claim this prize, good luck to you all!"