My talk from Ignite Cincinnati (What you think about portable restrooms) is up on youtube(!) I've posted about the talk before, but it was a blast and a challenge. I think the presentation was really successful in the long run, and it was a total rush to make 400 people laugh (you'll hear it in the video.)
The premise for Ignite is that you give a 20 slide presentation in 5 minutes. The slides advance automatically after 15 seconds.
I kept looking back at the screen during my talk to make sure I was talking about the correct slide (there wasn't a working monitor in front of me.)