What are your favorite dvd commentaries?

So here’s the thing. Usually I don’t give a good gaddamn about dvd extras. Except commentaries. If there’s a commentary on a movie I own I assure you I’ve heard it at least once, Sometimes that’s it, but there are those that you visit from time to time like old friends. And then there are the one’s you’ve watched the movie with more than the original audio.

I can’t possibly be alone in this.

What are your favorites? What makes them special?