Where were you on September 11, 2001?
I remember where I was: I was at work at one of the Manchester hospitals, back when I was working full-time as a network engineer. I was in my cubicle working when one of my colleagues at that time stuck his head into the room and said, "a plane crashed into the World Trade Center." Nobody was sure whether or not to believe him, but we all found a television set in time to see the second plane crash into the North Tower.
That day will be etched into my mind for as long as I live. I will never forget.