For the first time, and years before the syllabus would have included them, I got to see the Unforgivable Curses in action. For my part, I think that they're not normally necessary; there are all sorts of interesting ways to hurt someone other than with the Cruciatus, and whoever needs the Killing Curse when there are so many other ways? Hogwarts, a History was most informative on wizard murder. Not to mention Muggle methods...