Hamlet. One of the most psychologically complex masterpieces in the English language. And I agree about the teaching. Watching a great actor take on the Bard and seeing a great film adaptation is really illuminating (and really, Mel Gibson's take on the melancholy Dane is actually much better than many people would suggest), as is watching someone with real classical training (Branagh's Henry V is probably my favorite, and the Crispin's Day speech is still one of the best of all time, curbed in everything from Braveheart to The Lord of the Rings: The Return of the King), but Iago and Richard III (see McKellen's mesmerizing performance in Richard Loncraine's twisted adaptation to see some of the best acting you will ever witness). I don't think that the English language will ever see another like him. My professor instilled a great love of the Bard in me in college, and I'm forever grateful.