September 11, 2001 is one of those dates that everybody who was around remembers where they were and what they were doing. In my case, it wasn't anything very interesting, so instead of telling you about that day, I'll tell you about September 10, 2002.
The first interaction I had with a human being that day was when I was walking the dog on a public sidewalk and the owner of a pit bull snarled at me for walking my dog on his sidewalk. (Note that pit bulls never scare me personally, but pit bull owners frequently do.)
Then I was working on my responsibilities as administrator of the Boston Recorder Society (I'm no longer involved, but at that point they were paying me some money to keep things going.) I received the news that the prominent coach who had wanted to be named music director had decided that she needed to completely break with the Boston group because of my completely unreasonable request that other webmasters should link to the up-to-date information on the official BRS website instead of the out-of-date stuff she had on her site.
This sounds like something that should just be laughed off, but in fact, at that time in the Boston early music world, if this person blew up at you because you said "Good morning" (or "Please link to the correct information"), a whole bunch of people would tell you that you were being tactless.
Then the homebrew club blew up, because someone decided to quit because the October picnic organzers hadn't taken his recommendation for what kind of Octoberfest beer to buy a keg of.
Then I was going out to walk the dog for the afternoon and there was a packet of papers from the condo association. At this point I was serving as president, and was scheduled to chair a meeting that evening.
One item in the packet was labeled "Action by the Association's Trustees without a meeting", and contained statements about a dispute I was having with my then next-door neighbor about how noisy the Cantabile Band rehearsals were. None of the other three trustees had ever spoken to me about the issue, but all three of them had signed this "action". There was also a letter that one of the other trustees had written independantly to a lawyer the association was consulting, officially through me.
So I decided that if all three of the other trustees didn't want to work with me, I would resign and go to a bar instead of to that meeting.
This was the one good part of the day. Several of my friends from the homebrew club were there, the beer was good, we spent part of the evening at the tables outside, and I was able to tell them all about my terrible day.
One theory my friends proposed about why everything blew up in one day was that people were unconsciously stressed about the one year anniversary of 9/11. I'm not sure I believe that theory, but it's certainly the most blowups in one day I've ever had to deal with, in a long life of organizing.