"I didn't get rid of the Bandon Banshee by smiling at her!"

"I pray you, in your letters, / When you shall these unlucky deeds relate, / Speak of me as I am, nothing extenuate, / Nor set down aught in malice" (Othello, V.ii.339-42).

In Othello's final speech, he reestablishes his greatness and illustrates himself as a classic Shakespearean tragic hero.  First, as quoted above, he requests of his audience that they talk about him as he is -- nothing more, nothing less.

Then, Othello continues to say that he was "perplexed in the extreme" (V.ii.345).  When Othello killed his wife, he acted out of jealousy, but he argues that this jealousy was not entirely his fault.  Instead, he admitted that we was duped by the genius, witty, and attractive Iago.  (I'm taking some liberties in paraphrasing the text, here.)  I would argue that Othello's tragic flaw isn't his jealousy but his innate gullibility -- as Othello said in his speech, he is not naturally jealous but was hoodwinked into jealousy by the intelligent and beautiful Iago.  (Again, taking some liberties.)

Finally, Othello makes a little analogy.  One lovely morning*, Othello witnessed a Turk beating a Venetian, and Othello "took by the throat the circumcised dog / And smote him, thus" (V.ii.354-5).  Othello compared himself to Venice's enemy and explained through this analogy that he did not deserve to live due to his disservice to his people.  What a guy.

*lovely morning: setting not actually specified in the text