11th grade A/V class. Watched some of it on the screens, both towers up, 1 on fire, then class, and after class was over (last 5-odd minutes left before the bell) no more towers.
Of course, I've been re-assuring everyone in class that this was another incident that'll blow over and we'll continue on with our lives. Once I saw the blank canvas that was part of the skyline, I was pissed off. Not as much that the towers fell, but that the confidence of everyone that witnessed just as it started and after, turned into a vacuum; there was less confidence throughout the whole place than a hardcore badass alpha bully being confronted and defeated by the resident weakling victim (you know the kind; the ones that even other victims bully on). Was I the only other person in my school that had more than enough faith in our country (and everyone in New York) that despite whatever caused it (which I learned later were planes), those towers would still stand (albeit unstably)? Even the sheer force of our will (again, every witness) would make them stand at least a little longer, the lack of it I felt, pissed me the hell off. Knowing our military, I knew also that the leader of the whole operation will not last long either. We will find them, and they will be executed (and so we did).
Of course, at the time, I was the full-on faithful type which devoted alot into these kinds of faith things. And even throughout the decade afterwards, I was not shaken up by the event once, I wanted the effect of it to stop making everyone lose face in front of conflict and essentially not move on with their life despite it. In a sense, I think my behavior throughout that fateful day sealed the deal with my chances of making any new friends or even getting a date with anyone at that school (in a sense, I was the school's resident heretic from that day forth). Of course, I still moved on.
Oh right, I was born in New York, and I knew what they were capable of. Okay, I was startled a tad when it happened (like reacting to a spider wandering right into my sight out of nowhere), but I didn't let it rule the rest of my life like most people I knew.
EDIT:
I find it nice that we share a common trait of not having this day rule our lives. It means that we still have our heads, even if a few of us have a few screws loose (not that it's a bad thing).