It's interesting to read that there are other people here who saw one of the planes go into the tower live on tv. Most people I know saw & came to know of the events after, I was always the exception.
I had just returned home from work; used to teach Web Development at a local Institute. Had been a long day; this was evening time where I was. Had been a long week in fact.
Was taking off socks & changing into something comfortable, and as a ritual, had the news running on TV, CNN if I remember correctly. They were reporting about the first plane crash into the tower - reporting it as a crash - since no one knew what this was at that moment between the first & second crash.
I saw the 2nd plane coming in as they were focusing on the burning wreckage in the first tower, and saw it crash into the second tower as they were talking about the fire. The reporters didn't actually notice the 2nd plane until it hit the tower, or at least didn't mention it until it actually hit.
I think for a few minutes I was frozen in time. I believe I had one sock off, the other one still in the process of being removed. No one else was home at the time. The word "terrorist attack" started to take shape in the running commentary that you could barely hear over the pandemonium in the background. I wasn't sure what I had witnessed; I hadn't seen anything like it ever before - like most of us.
Terrorist attack was a "concept" at the time; prominent in Asian countries, especially the middle east; but not so much in the western hemisphere. Although I was in India at the time; most of my family was in the United States. It took me a few minutes to realize what was going on, and to come in grips of what I had just witnessed on live tv.
I didn't stop watching the news till Monday morning when I had to go back to work. My bag & some other things were in the same spot Monday morning, where I had dropped them off Friday evening when I reached home & turned on the news.