So where were you 4 years ago?
I was at a Composite Materials conference at Virginia Tech in Blacksburg, Virginia. I had driven there the day before and after breakfast I returned to my hotel room to see the news. I sat in shock. I went down to the conference center lobby. Crowds of people were staring at cable news feeds.
I had to give a presentation on Vacuum Assisted Resin Transfer Molding later that day. I gave it. It was bad, partly because no one was really interested and partly because I spent all my preparation time staring at cable news feeds.
Still, it is nice to know that I'll never have a public speaking experience worse than that one.
UPDATE: Joe Cathey is a bit more specific about what he was doing than I am.