I used to have a service business and did work in the south tower of the WTC, on a high floor, every month for over 10 years.
I often saw small planes flying down the Hudson River LOWER than the altitude I was at in the building, and sometimes even thought ‘Gee, if a pilot just made a slight momentary slip in his steering, he could crash into the building’.
So, of course, the day of the attack, when I first heard the news, I thought, ‘Hey, what I had thought about, actually has happened!’ Even a bit later when I heard that the “tower had fallen”, I thought they meant the big TV antennae on TOP of the tower. I never dreamed that they meant the WHOLE building!
Of course, shortly thereafter, I heard about the second tower being hit, and then the Pentagon, and it was clear that we were under attack.