If you were in potions class and happened to create a perfect Draught of Living Death, thus earning the prized Felix Felicis potion from Professor Slughorn,on what day would you use it? Would you take the potions during your final exams for school? During a sports tryout? On a job interview? I've sometimes contemplated when I might have taken the mythical potion. The difficulty in deciding is that you can only use it once and then it's gone, so be duly advised to choose wisely.