What did you do on 9/11?

I was teaching a Solaris security course that day, with some NATO people in the class.
I remember meeting my colleague Guido in the corridor saying "World War III just started".
I told the class the news and went on with the course.
Next morning, Raoul, manager of Sun Education Belgium, had a minute of silence for everybody.
One of the British officers told another NATO attendee he should not be wearing a US Army T-shirt, because he was exposing himself as a target.