In 2008, I gave a presentation titled "Talking Trash" at Ignite Portland (IP3) in front of a theater filled with 600 hipsters.  The format was straightforward: I had 20 slides, with 15 seconds per slide.  It was a fast, fun five minutes.  The crowd went wild when I exclaimed, "An airport that composts?  That is so cool!"

You can read my proposal.
Or watch my presentation.